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Farber NI, Chin OY, Mills DM, Diaz RC, Brodie HA, Sagiv D. Cochlear Implantation in Charcot-Marie-Tooth Patients: Speech Perception and Quality of Life. Ann Otol Rhinol Laryngol 2024; 133:469-475. [PMID: 38361273 DOI: 10.1177/00034894241232206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
OBJECTIVES There is a limited understanding of the impact of cochlear implantation (CI) in patients with Charcot-Marie-Tooth disease (CMT), given the scarcity of reported cases. We aim to evaluate the audiological outcomes and quality of life (QoL) after CI in CMT. METHODS Multi-institutional, university-affiliated, tertiary-referral centers, retrospective chart review.Our cohort includes 5 patients with CMT. Patients' charts were reviewed for demographic characteristics, operation notes, and pre- and post-implantation audiology evaluation. Patients completed the Cochlear Implant Quality of Life-10 (CIQOL-10) Global questionnaire. RESULTS Pre-implantation, the mean pure tone average was 84.1 ± 7.2 dB, and the mean word recognition score was 2.4% in the implanted ear. AzBio sentence test was performed in quiet, revealing a mean of 4 ± 1.4% in the implanted ear. Post-implantation, PTA results were all within the mild hearing loss range (mean 33.0 ± 5.9 dB). Post-CI, AZ-Bio test results were 5%, 65%, and 74% (for 3 patients), and HINT scores were 55% and 58% (for 2 patients). The mean score of the CIQOL-10 questionnaire was 42.7 ± 10.47 (range 1-100). Patients were most satisfied with their ability to listen to the television or radio, have conversations in a quiet environment, and feel comfortable being themselves. CONCLUSION To the best of our knowledge, this is the most extensive series of CI in CMT-associated sensorineural hearing loss and auditory neuropathy. Our cohort suggests that CI is a safe and reliable method for hearing rehabilitation that can achieve good speech performance and improve QoL in CMT patients.
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Affiliation(s)
- Nicole I Farber
- Department of Otolaryngology-Head and Neck Surgery, University of California-Davis, Sacramento, CA, USA
| | - Oliver Y Chin
- Department of Otolaryngology-Head and Neck Surgery, University of California-Davis, Sacramento, CA, USA
| | - Dawna M Mills
- Department of Otolaryngology-Head and Neck Surgery, University of California-Davis, Sacramento, CA, USA
| | - Rodney C Diaz
- Department of Otolaryngology-Head and Neck Surgery, University of California-Davis, Sacramento, CA, USA
| | - Hilary A Brodie
- Department of Otolaryngology-Head and Neck Surgery, University of California-Davis, Sacramento, CA, USA
| | - Doron Sagiv
- Department of Otolaryngology-Head and Neck Surgery, University of California-Davis, Sacramento, CA, USA
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He S, Skidmore J, Bruce IC, Oleson JJ, Yuan Y. Peripheral Neural Synchrony in Postlingually Deafened Adult Cochlear Implant Users. Ear Hear 2024:00003446-990000000-00264. [PMID: 38503720 DOI: 10.1097/aud.0000000000001502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
OBJECTIVES This paper reports a noninvasive method for quantifying neural synchrony in the cochlear nerve (i.e., peripheral neural synchrony) in cochlear implant (CI) users, which allows for evaluating this physiological phenomenon in human CI users for the first time in the literature. In addition, this study assessed how peripheral neural synchrony was correlated with temporal resolution acuity and speech perception outcomes measured in quiet and in noise in postlingually deafened adult CI users. It tested the hypothesis that peripheral neural synchrony was an important factor for temporal resolution acuity and speech perception outcomes in noise in postlingually deafened adult CI users. DESIGN Study participants included 24 postlingually deafened adult CI users with a Cochlear™ Nucleus® device. Three study participants were implanted bilaterally, and each ear was tested separately. For each of the 27 implanted ears tested in this study, 400 sweeps of the electrically evoked compound action potential (eCAP) were measured at four electrode locations across the electrode array. Peripheral neural synchrony was quantified at each electrode location using the phase-locking value (PLV), which is a measure of trial-by-trial phase coherence among eCAP sweeps/trials. Temporal resolution acuity was evaluated by measuring the within-channel gap detection threshold (GDT) using a three-alternative, forced-choice procedure in a subgroup of 20 participants (23 implanted ears). For each ear tested in these participants, GDTs were measured at two electrode locations with a large difference in PLVs. For 26 implanted ears tested in 23 participants, speech perception performance was evaluated using consonant-nucleus-consonant (CNC) word lists presented in quiet and in noise at signal to noise ratios (SNRs) of +10 and +5 dB. Linear Mixed effect Models were used to evaluate the effect of electrode location on the PLV and the effect of the PLV on GDT after controlling for the stimulation level effects. Pearson product-moment correlation tests were used to assess the correlations between PLVs, CNC word scores measured in different conditions, and the degree of noise effect on CNC word scores. RESULTS There was a significant effect of electrode location on the PLV after controlling for the effect of stimulation level. There was a significant effect of the PLV on GDT after controlling for the effects of stimulation level, where higher PLVs (greater synchrony) led to lower GDTs (better temporal resolution acuity). PLVs were not significantly correlated with CNC word scores measured in any listening condition or the effect of competing background noise presented at an SNR of +10 dB on CNC word scores. In contrast, there was a significant negative correlation between the PLV and the degree of noise effect on CNC word scores for a competing background noise presented at an SNR of +5 dB, where higher PLVs (greater synchrony) correlated with smaller noise effects on CNC word scores. CONCLUSIONS This newly developed method can be used to assess peripheral neural synchrony in CI users, a physiological phenomenon that has not been systematically evaluated in electrical hearing. Poorer peripheral neural synchrony leads to lower temporal resolution acuity and is correlated with a larger detrimental effect of competing background noise presented at an SNR of 5 dB on speech perception performance in postlingually deafened adult CI users.
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Affiliation(s)
- Shuman He
- Department of Otolaryngology-Head and Neck Surgery, The Ohio State University, Columbus, Ohio, USA
- Department of Audiology, Nationwide Children's Hospital, Columbus, Ohio, USA
| | - Jeffrey Skidmore
- Department of Otolaryngology-Head and Neck Surgery, The Ohio State University, Columbus, Ohio, USA
| | - Ian C Bruce
- Department of Electrical & Computer Engineering, McMaster University, Hamilton, Ontario, Canada
| | - Jacob J Oleson
- Department of Biostatistics, The University of Iowa, Iowa City, Iowa, USA
| | - Yi Yuan
- Department of Otolaryngology-Head and Neck Surgery, The Ohio State University, Columbus, Ohio, USA
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He S, Skidmore J, Bruce IC, Oleson JJ, Yuan Y. Peripheral neural synchrony in post-lingually deafened adult cochlear implant users. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2024:2023.07.07.23292369. [PMID: 37461681 PMCID: PMC10350140 DOI: 10.1101/2023.07.07.23292369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
Objective This paper reports a noninvasive method for quantifying neural synchrony in the cochlear nerve (i.e., peripheral neural synchrony) in cochlear implant (CI) users, which allows for evaluating this physiological phenomenon in human CI users for the first time in the literature. In addition, this study assessed how peripheral neural synchrony was correlated with temporal resolution acuity and speech perception outcomes measured in quiet and in noise in post-lingually deafened adult CI users. It tested the hypothesis that peripheral neural synchrony was an important factor for temporal resolution acuity and speech perception outcomes in noise in post-lingually deafened adult CI users. Design Study participants included 24 post-lingually deafened adult CI users with a Cochlear™ Nucleus® device. Three study participants were implanted bilaterally, and each ear was tested separately. For each of the 27 implanted ears tested in this study, 400 sweeps of the electrically evoked compound action potential (eCAP) were measured at four electrode locations across the electrode array. Peripheral neural synchrony was quantified at each electrode location using the phase locking value (PLV), which is a measure of trial-by-trial phase coherence among eCAP sweeps/trials. Temporal resolution acuity was evaluated by measuring the within-channel gap detection threshold (GDT) using a three-alternative, forced-choice procedure in a subgroup of 20 participants (23 implanted ears). For each ear tested in these participants, GDTs were measured at two electrode locations with a large difference in PLVs. For 26 implanted ears tested in 23 participants, speech perception performance was evaluated using Consonant-Nucleus-Consonant (CNC) word lists presented in quiet and in noise at signal-to-noise ratios (SNRs) of +10 and +5 dB. Linear Mixed effect Models were used to evaluate the effect of electrode location on the PLV and the effect of the PLV on GDT after controlling for the stimulation level effects. Pearson product-moment correlation tests were used to assess the correlations between PLVs, CNC word scores measured in different conditions, and the degree of noise effect on CNC word scores. Results There was a significant effect of electrode location on the PLV after controlling for the effect of stimulation level. There was a significant effect of the PLV on GDT after controlling for the effects of stimulation level, where higher PLVs (greater synchrony) led to lower GDTs (better temporal resolution acuity). PLVs were not significantly correlated with CNC word scores measured in any listening condition or the effect of competing background noise presented at a SNR of +10 dB on CNC word scores. In contrast, there was a significant negative correlation between the PLV and the degree of noise effect on CNC word scores for a competing background noise presented at a SNR of +5 dB, where higher PLVs (greater synchrony) correlated with smaller noise effects on CNC word scores. Conclusions This newly developed method can be used to assess peripheral neural synchrony in CI users, a physiological phenomenon that has not been systematically evaluated in electrical hearing. Poorer peripheral neural synchrony leads to lower temporal resolution acuity and is correlated with a larger detrimental effect of competing background noise presented at a SNR of 5 dB on speech perception performance in post-lingually deafened adult CI users.
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Affiliation(s)
- Shuman He
- Department of Otolaryngology – Head and Neck Surgery, The Ohio State University, 915 Olentangy River Road, Columbus, OH 43212
- Department of Audiology, Nationwide Children’s Hospital, 700 Children’s Drive, Columbus, OH 43205
| | - Jeffrey Skidmore
- Department of Otolaryngology – Head and Neck Surgery, The Ohio State University, 915 Olentangy River Road, Columbus, OH 43212
| | - Ian C. Bruce
- Department of Electrical & Computer Engineering, McMaster University, Hamilton, ON, L8S 4K1, Canada
| | - Jacob J. Oleson
- Department of Biostatistics, The University of Iowa, Iowa City, IA 52242
| | - Yi Yuan
- Department of Otolaryngology – Head and Neck Surgery, The Ohio State University, 915 Olentangy River Road, Columbus, OH 43212
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Xie R, Wang M, Zhang C. Mechanisms of age-related hearing loss at the auditory nerve central synapses and postsynaptic neurons in the cochlear nucleus. Hear Res 2024; 442:108935. [PMID: 38113793 PMCID: PMC10842789 DOI: 10.1016/j.heares.2023.108935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 12/04/2023] [Accepted: 12/08/2023] [Indexed: 12/21/2023]
Abstract
Sound information is transduced from mechanical vibration to electrical signals in the cochlea, conveyed to and further processed in the brain to form auditory perception. During the process, spiral ganglion neurons (SGNs) are the key cells that connect the peripheral and central auditory systems by receiving information from hair cells in the cochlea and transmitting it to neurons of the cochlear nucleus (CN). Decades of research in the cochlea greatly improved our understanding of SGN function under normal and pathological conditions, especially about the roles of different subtypes of SGNs and their peripheral synapses. However, it remains less clear how SGN central terminals or auditory nerve (AN) synapses connect to CN neurons, and ultimately how peripheral pathology links to structural alterations and functional deficits in the central auditory nervous system. This review discusses recent progress about the morphological and physiological properties of different subtypes of AN synapses and associated postsynaptic CN neurons, their changes during aging, and the potential mechanisms underlying age-related hearing loss.
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Affiliation(s)
- Ruili Xie
- Department of Otolaryngology, The Ohio State University, 420 W 12th Ave, Columbus OH 43210, USA; Department of Neuroscience, The Ohio State University, 420W 12th Ave, Columbus, OH 43210, USA.
| | - Meijian Wang
- Department of Otolaryngology, The Ohio State University, 420 W 12th Ave, Columbus OH 43210, USA
| | - Chuangeng Zhang
- Department of Otolaryngology, The Ohio State University, 420 W 12th Ave, Columbus OH 43210, USA
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Hintze A, Lange F, Steyer AM, Anstatt J, Möbius W, Jakobs S, Wichmann C. Developmental changes of the mitochondria in the murine anteroventral cochlear nucleus. iScience 2024; 27:108700. [PMID: 38213623 PMCID: PMC10783593 DOI: 10.1016/j.isci.2023.108700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 10/22/2023] [Accepted: 12/06/2023] [Indexed: 01/13/2024] Open
Abstract
Mitochondria are key organelles to provide ATP for synaptic transmission. This study aims to unravel the structural adaptation of mitochondria to an increase in presynaptic energy demand and upon the functional impairment of the auditory system. We use the anteroventral cochlear nucleus (AVCN) of wild-type and congenital deaf mice before and after hearing onset as a model system for presynaptic states of lower and higher energy demands. We combine focused ion beam scanning electron microscopy and electron tomography to investigate mitochondrial morphology. We found a larger volume of synaptic boutons and mitochondria after hearing onset with a higher crista membrane density. In deaf animals lacking otoferlin, we observed a shallow increase of mitochondrial volumes toward adulthood in endbulbs, while in wild-type animals mitochondria further enlarged. We propose that in the AVCN, presynaptic mitochondria undergo major structural changes likely to serve higher energy demands upon the onset of hearing and further maturation.
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Affiliation(s)
- Anika Hintze
- Molecular Architecture of Synapses Group, Institute for Auditory Neuroscience, InnerEarLab and Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Felix Lange
- Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, 37077 Göttingen, Germany
- Clinic of Neurology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Anna M. Steyer
- Multiscale Bioimaging Cluster of Excellence (MBExC), University of Göttingen, 37075 Göttingen, Germany
- Electron Microscopy-City Campus, Department of Neurogenetics, Max Planck Institute for Multidisciplinary Sciences, 37075 Göttingen, Germany
| | - Jannis Anstatt
- Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, 37077 Göttingen, Germany
- Clinic of Neurology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Wiebke Möbius
- Multiscale Bioimaging Cluster of Excellence (MBExC), University of Göttingen, 37075 Göttingen, Germany
- Electron Microscopy-City Campus, Department of Neurogenetics, Max Planck Institute for Multidisciplinary Sciences, 37075 Göttingen, Germany
| | - Stefan Jakobs
- Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, 37077 Göttingen, Germany
- Clinic of Neurology, University Medical Center Göttingen, 37075 Göttingen, Germany
- Multiscale Bioimaging Cluster of Excellence (MBExC), University of Göttingen, 37075 Göttingen, Germany
- Translational Neuroinflammation and Automated Microscopy, Fraunhofer Institute for Translational Medicine and Pharmacology ITMP, Göttingen, Germany
| | - Carolin Wichmann
- Molecular Architecture of Synapses Group, Institute for Auditory Neuroscience, InnerEarLab and Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, 37075 Göttingen, Germany
- Multiscale Bioimaging Cluster of Excellence (MBExC), University of Göttingen, 37075 Göttingen, Germany
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Morlet T, Valania J, Walter C, Morini G, O'Reilly RC, Parkes W, Pritchett C. Cortical Auditory Evoked Potential Testing in Children With Auditory Neuropathy Spectrum Disorder. Am J Audiol 2023:1-12. [PMID: 38048283 DOI: 10.1044/2023_aja-23-00051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2023] Open
Abstract
PURPOSE In the present report, we reviewed the role of cortical auditory evoked potentials (CAEPs) as an objective measure during the evaluation and management process in children with auditory neuropathy spectrum disorder (ANSD). METHOD We reviewed the results of CAEP recordings in 66 patients with ANSD aged between 2 months and 12 years and assessed the relationship between their characteristics (prevalence, morphology, latencies, and amplitudes) and various clinical features, including the mode of medical management. RESULTS Overall, the CAEPs were present in 85.2% of the ears tested. Factors such as prematurity, medical complexity, neuronal issues, or presence of syndromes did not have an effect on the presence or absence of CAEPs. CAEP latencies were significantly shorter in ears with cochlear nerve deficiency than in ears with a normal caliber nerve. Three different patterns of CAEP responses were observed in patients with bilateral ANSD and present cochlear nerves: (a) responses with normal morphology and presence of both P1-P2complex and N2 components, (b) responses with abnormal morphology and presence of the N2 component but undefined P1-P2complex peak, and (c) entirely absent responses. None of the patients with normal, mild, or moderate degree of hearing loss had a complete absence of CAEP responses. No significant differences were uncovered when comparing the latencies across unaided and aided children and children who later received cochlear implants. CONCLUSIONS The CAEP protocol used in our ANSD program did inform about the presence or absence of central auditory stimulation. Absent responses typically fit into an overall picture of complete auditory deprivation and all of these children were ultimately offered cochlear implants after failing to develop oral language. Present responses, on the other hand, were acknowledged as a sign of some degree of auditory stimulation but always interpreted with caution given that prognostic implications remain unclear.
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Affiliation(s)
- Thierry Morlet
- Auditory Physiology and Psychoacoustics Research Laboratory, Nemours Children Hospital, Wilmington, DE
- Department of Communication Sciences and Disorders, College of Health Sciences, University of Delaware, Newark
- Osborne College of Audiology, Salus University, Elkins Park, PA
| | | | - Cassidy Walter
- Department of Speech, Language and Hearing Sciences, The George Washington University, Washington, DC
| | - Giovanna Morini
- Department of Communication Sciences and Disorders, College of Health Sciences, University of Delaware, Newark
| | | | - William Parkes
- Department of Otolaryngology, Nemours Children Hospital, Wilmington, DE
| | - Cedric Pritchett
- Department of Otolaryngology, Nemours Children Hospital, Orlando, FL
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Boboshko MY, Savenko IV, Garbaruk ES, Knyazeva VM, Vasilyeva MJ. Impact of Prematurity on Auditory Processing in Children. PATHOPHYSIOLOGY 2023; 30:505-521. [PMID: 37987307 PMCID: PMC10661290 DOI: 10.3390/pathophysiology30040038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 10/16/2023] [Accepted: 10/24/2023] [Indexed: 11/22/2023] Open
Abstract
Prematurity is one of the most crucial risk factors negatively affecting the maturation of the auditory system. Children born preterm demonstrate high rates of hearing impairments. Auditory processing difficulties in preterm children might be a result of disturbances in the central auditory system development and/or sensory deprivation due to peripheral hearing loss. To investigate auditory processing in preterm children, we utilized a set of psychoacoustic tests to assess temporal processing and speech intelligibility. A total of 241 children aged 6-11 years old (136 born preterm and 105 healthy full-term children forming the control group) were assessed. The preterm children were divided into three groups based on their peripheral hearing status: 74 normal hearing (NH group); 30 children with bilateral permanent sensorineural hearing loss (SNHL group) and 32 children with bilateral auditory neuropathy spectrum disorder (ANSD group). The results showed significantly worse performance in all tests in premature children compared with full-term children. NH and SNHL groups showed significant age-related improvement in speech recognition thresholds in noise that might signify a "bottom-up" auditory processing maturation effect. Overall, all premature children had signs of auditory processing disorders of varying degrees. Analyzing and understanding the auditory processing specificity in preterm children can positively contribute to the more effective implementation of rehabilitation programs.
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Affiliation(s)
- Maria Y. Boboshko
- Department of Higher Nervous Activity and Psychophysiology, St. Petersburg State University, 199034 St. Petersburg, Russia;
- Laboratory of Hearing and Speech, Pavlov First St. Petersburg State Medical University, 197022 St. Petersburg, Russia; (I.V.S.); (E.S.G.)
| | - Irina V. Savenko
- Laboratory of Hearing and Speech, Pavlov First St. Petersburg State Medical University, 197022 St. Petersburg, Russia; (I.V.S.); (E.S.G.)
| | - Ekaterina S. Garbaruk
- Laboratory of Hearing and Speech, Pavlov First St. Petersburg State Medical University, 197022 St. Petersburg, Russia; (I.V.S.); (E.S.G.)
- Scientific Research Center, St. Petersburg State Pediatric Medical University, 194100 St. Petersburg, Russia
| | - Veronika M. Knyazeva
- Department of Higher Nervous Activity and Psychophysiology, St. Petersburg State University, 199034 St. Petersburg, Russia;
| | - Marina J. Vasilyeva
- Department of Higher Nervous Activity and Psychophysiology, St. Petersburg State University, 199034 St. Petersburg, Russia;
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Sreenivasan A, Krishna R, Nair PP, Alexander A. Assessment of auditory perception abilities using temporal envelope and fine structure processing in children with self-limited epilepsy with centrotemporal spikes. Epilepsy Res 2023; 196:107204. [PMID: 37591182 DOI: 10.1016/j.eplepsyres.2023.107204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 08/04/2023] [Accepted: 08/04/2023] [Indexed: 08/19/2023]
Abstract
OBJECTIVES Children with self-limited epilepsy with centrotemporal spikes (SeLECTS) exhibit difficulty processing spoken messages without hearing loss. The temporal envelope and fine structure processing abilities are the fundamental aspects of the normal listening process. There is limited literature on the temporal envelope and fine structure processing in children with SeLECTS. We evaluated the temporal envelope and fine structure processing in children with SeLECTS. DESIGN The study included 35 children with SeLECTS and 50 typically developing children (TDC). The temporal envelope processing was measured using the temporal modulation transfer function (TMTF) and temporal fine structure using the temporal fine structure low-frequency (TFS LF) test. The TMTF was measured for the modulation rates 4, 8, 16, 32, 64 and 128 Hz. The TFS LF was done for 250, 500 and 750 Hz. RESULTS The difference in modulation detection thresholds at 4 Hz was not found to be significant, whereas there was a significant difference in modulation detection thresholds observed for all the other modulation frequencies (p < 0.05) between the children with SeLECTS and TDC. The thresholds at 250, 500 and 750 Hz were higher (poorer) for children with SeLECTS than the TDC and was significant (p < 0.05). CONCLUSIONS The TMTF and TFS LF tests were of practical use in evaluating temporal envelope and fine structure processing abilities in children with SeLECTS. The results suggest that children with SeLECTS have a poor temporal envelope and fine structure processing compared to the TDC.
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Affiliation(s)
- Anuprasad Sreenivasan
- Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Department of ENT, Puducherry, India.
| | - Rajalakshmi Krishna
- School of Rehabilitation and Behavioral Sciences, VMRF(DU), Aarupadai Veedu Medical College and Hospital, Puducherry, India.
| | - Pradeep Pankajakshan Nair
- Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Department of Neurology, Puducherry, India.
| | - Arun Alexander
- Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Department of ENT, Puducherry, India.
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Muthukumar R, Jaya V, Vignesh SS, Thenmozhi K. Prevalence and Auditory Characteristics of Auditory Neuropathy Spectrum Disorder in Adult Population with Sensory Neural Hearing Loss: A Hospital Based Study in South India. Indian J Otolaryngol Head Neck Surg 2023; 75:1906-1911. [PMID: 37636754 PMCID: PMC10447738 DOI: 10.1007/s12070-023-03766-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Accepted: 03/31/2023] [Indexed: 08/29/2023] Open
Abstract
Auditory neuropathy spectrum disorder (ANSD) is a heterogenous group of disorder characterized by abnormalities in auditory brainstem responses (ABR) with preserved otoacoustic emissions and/or cochlear microphonics. The aim of the study is to estimate the prevalence and evaluate the audiological characteristics of ANSD in adult population with sensory neural hearing loss. A prospective study was conducted on the adult population (≥ 18 years) attending ENT outpatients clinic at Rajiv Gandhi Government General Hospital, Chennai. All patients reported to the department with auditory and vestibular symptoms underwent case history, otoscopic examination, and routine audiological evaluation (pure tone audiometry, speech audiometry and immittance audiometry). Patients with indications of ANSD in case history and routine audiological evaluation were further evaluated using distortion product otoacoustic emissions and ABR. A total of 8682 adult population was evaluated during the period of 2017 to 2018. Out of 8682 patients, 1343 (15.46%) of them had sensory neural hearing loss of varying degrees. Out of 1343 adults with sensory neural hearing loss, 24 (1.78%) adults were diagnosed as ANSD. The prevalence of ANSD in adult population with sensory neural hearing loss in our study is 1.32% per 1000 adults. The clinical characteristics of ANSD shows impairment in speech perception irrespective of degree of hearing loss, preserved cochlear functions and abnormal ABR. Hence ANSD is not a rare clinical finding in adults with sensory neural hearing loss, but its prevalence was estimated to be lower in Indian population. Often young females are affected causing significant impairment in speech perception and disability.
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Affiliation(s)
- R Muthukumar
- Upgraded Institute of Otorhinolaryngology and Institute of Speech and Hearing, Madras Medical college and Rajiv Gandhi Government General hospital, Chennai, 600003 India
| | - V Jaya
- Institute of Speech and Hearing, Madras Medical college and Rajiv Gandhi Government General hospital, Chennai, Tamil Nadu 600003 India
| | - S S Vignesh
- Institute of Speech and Hearing, Madras Medical college and Rajiv Gandhi Government General hospital, Chennai, Tamil Nadu 600003 India
| | - K Thenmozhi
- Institute of Speech and Hearing, Madras Medical college and Rajiv Gandhi Government General hospital, Chennai, Tamil Nadu 600003 India
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Drakopoulos F, Vasilkov V, Osses Vecchi A, Wartenberg T, Verhulst S. Model-based hearing-enhancement strategies for cochlear synaptopathy pathologies. Hear Res 2022; 424:108569. [DOI: 10.1016/j.heares.2022.108569] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 07/07/2022] [Accepted: 07/12/2022] [Indexed: 11/04/2022]
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The Intelligibility of Time-Compressed Speech Is Correlated with the Ability to Listen in Modulated Noise. J Assoc Res Otolaryngol 2022; 23:413-426. [DOI: 10.1007/s10162-021-00832-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 12/15/2021] [Indexed: 10/18/2022] Open
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Almishaal AA, Saleh S, Alferaih H, Alhelo O. Prevalence, risk factors, and audiological characteristics of auditory neuropathy. Int J Audiol 2021; 61:1018-1026. [PMID: 34928752 DOI: 10.1080/14992027.2021.2014074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
OBJECTIVE The objective of this study was to determine the prevalence, risk factors, and audiological characteristics of auditory neuropathy spectrum disorder (ANSD) in the pediatric population. DESIGN A retrospective review of medical charts was conducted for children visiting two hospitals in Saudi Arabia. STUDY SAMPLE Medical records of 1025 patients with sensorineural hearing loss (SNHL) were reviewed. We analyzed the databases for results of audiological examinations, risk factors, and outcomes of intervention including hearing aid (HA) and cochlear implantation (CI). RESULTS Out of 1025 children with SNHL, 101 patients (9.85%) were identified to have ANSD. Audiological characteristics of the ANSD group revealed a severe-to-profound degree of hearing loss, all showed type A tympanogram and absent reflexes, absent auditory brainstem response (ABR) findings with present cochlear microphonic while otoacoustic emissions were absent in 54.5% of patients. The most prevalent risk factors for ANSD in this group were family history of hearing loss, consanguinity, hyperbilirubinemia, and low birth weight. Pure tone and speech detection thresholds improved significantly with CI compared to HA use in this sample of patients with ANSD. CONCLUSION This study shows that ANSD is not extremely rare among Saudi children with severe to profound hearing loss, with a prevalence of 9.85%.
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Affiliation(s)
- Ali A Almishaal
- College of Applied Medical Sciences, University of Hail, Hail, Saudi Arabia
| | - Shaza Saleh
- King Abdullah Ear Specialist Center, King Saud University Medical City, Riyadh, Saudi Arabia
| | - Hala Alferaih
- Ear, Nose, and Throat Department, Audiology Clinic, King Fahad General Hospital, Jeddah, Saudi Arabia
| | - Osamah Alhelo
- College of Applied Medical Sciences, University of Hail, Hail, Saudi Arabia
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Soares JC, Veeranna SA, Parsa V, Allan C, Ly W, Duong M, Folkeard P, Moodie S, Allen P. Verification of a Mobile Psychoacoustic Test System. Audiol Res 2021; 11:673-690. [PMID: 34940019 PMCID: PMC8698855 DOI: 10.3390/audiolres11040061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 11/25/2021] [Accepted: 12/08/2021] [Indexed: 11/20/2022] Open
Abstract
Many hearing difficulties can be explained as a loss of audibility, a problem easily detected and treated using standard audiological procedures. Yet, hearing can be much poorer (or more impaired) than audibility predicts because of deficits in the suprathreshold mechanisms that encode the rapidly changing, spectral, temporal, and binaural aspects of the sound. The ability to evaluate these mechanisms requires well-defined stimuli and strict adherence to rigorous psychometric principles. This project reports on the comparison between a laboratory-based and a mobile system's results for psychoacoustic assessment in adult listeners with normal hearing. A description of both systems employed is provided. Psychoacoustic tests include frequency discrimination, amplitude modulation detection, binaural encoding, and temporal gap detection. Results reported by the mobile system were not significantly different from those collected with the laboratory-based system for most of the tests and were consistent with those reported in the literature. The mobile system has the potential to be a feasible option for the assessment of suprathreshold auditory encoding abilities.
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Affiliation(s)
- Jordana C. Soares
- National Centre for Audiology, Faculty of Health Sciences, Western University, London, ON N6G 1H1, Canada; (J.C.S.); (S.A.V.); (C.A.); (W.L.); (M.D.); (P.F.); (S.M.); (P.A.)
| | - Sangamanatha A. Veeranna
- National Centre for Audiology, Faculty of Health Sciences, Western University, London, ON N6G 1H1, Canada; (J.C.S.); (S.A.V.); (C.A.); (W.L.); (M.D.); (P.F.); (S.M.); (P.A.)
- School of Speech and Hearing Sciences, The University of Southern Mississippi, Hattiesburg, MS 39401, USA
| | - Vijay Parsa
- National Centre for Audiology, Faculty of Health Sciences, Western University, London, ON N6G 1H1, Canada; (J.C.S.); (S.A.V.); (C.A.); (W.L.); (M.D.); (P.F.); (S.M.); (P.A.)
- School of Communication Sciences and Disorders, Western University, London, ON N6A 3K7, Canada
- Department of Electrical and Computer Engineering, Western University, London, ON N6A 5B9, Canada
| | - Chris Allan
- National Centre for Audiology, Faculty of Health Sciences, Western University, London, ON N6G 1H1, Canada; (J.C.S.); (S.A.V.); (C.A.); (W.L.); (M.D.); (P.F.); (S.M.); (P.A.)
- School of Communication Sciences and Disorders, Western University, London, ON N6A 3K7, Canada
| | - Winnie Ly
- National Centre for Audiology, Faculty of Health Sciences, Western University, London, ON N6G 1H1, Canada; (J.C.S.); (S.A.V.); (C.A.); (W.L.); (M.D.); (P.F.); (S.M.); (P.A.)
| | - Minh Duong
- National Centre for Audiology, Faculty of Health Sciences, Western University, London, ON N6G 1H1, Canada; (J.C.S.); (S.A.V.); (C.A.); (W.L.); (M.D.); (P.F.); (S.M.); (P.A.)
| | - Paula Folkeard
- National Centre for Audiology, Faculty of Health Sciences, Western University, London, ON N6G 1H1, Canada; (J.C.S.); (S.A.V.); (C.A.); (W.L.); (M.D.); (P.F.); (S.M.); (P.A.)
| | - Sheila Moodie
- National Centre for Audiology, Faculty of Health Sciences, Western University, London, ON N6G 1H1, Canada; (J.C.S.); (S.A.V.); (C.A.); (W.L.); (M.D.); (P.F.); (S.M.); (P.A.)
- School of Communication Sciences and Disorders, Western University, London, ON N6A 3K7, Canada
| | - Prudence Allen
- National Centre for Audiology, Faculty of Health Sciences, Western University, London, ON N6G 1H1, Canada; (J.C.S.); (S.A.V.); (C.A.); (W.L.); (M.D.); (P.F.); (S.M.); (P.A.)
- School of Communication Sciences and Disorders, Western University, London, ON N6A 3K7, Canada
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Gransier R, Wouters J. Neural auditory processing of parameterized speech envelopes. Hear Res 2021; 412:108374. [PMID: 34800800 DOI: 10.1016/j.heares.2021.108374] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 10/01/2021] [Accepted: 10/13/2021] [Indexed: 10/19/2022]
Abstract
Speech perception depends highly on the neural processing of the speech envelope. Several auditory processing deficits are hypothesized to result in a reduction in fidelity of the neural representation of the speech envelope across the auditory pathway. Furthermore, this reduction in fidelity is associated with supra-threshold speech processing deficits. Investigating the mechanisms that affect the neural encoding of the speech envelope can be of great value to gain insight in the different mechanisms that account for this reduced neural representation, and to develop stimulation strategies for hearing prosthesis that aim to restore it. In this perspective, we discuss the importance of neural assessment of phase-locking to the speech envelope from an audiological view and introduce the Temporal Envelope Speech Tracking (TEMPEST) stimulus framework which enables the electrophysiological assessment of envelope processing across the auditory pathway in a systematic and standardized way. We postulate that this framework can be used to gain insight in the salience of speech-like temporal envelopes in the neural code and to evaluate the effectiveness of stimulation strategies that aim to restore temporal processing across the auditory pathway with auditory prostheses.
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Affiliation(s)
- Robin Gransier
- ExpORL, Department of Neurosciences, KU Leuven, 3000 Leuven, Belgium; Leuven Brain Institute, KU Leuven, 3000 Leuven, Belgium.
| | - Jan Wouters
- ExpORL, Department of Neurosciences, KU Leuven, 3000 Leuven, Belgium; Leuven Brain Institute, KU Leuven, 3000 Leuven, Belgium
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Multiple Cases of Auditory Neuropathy Illuminate the Importance of Subcortical Neural Synchrony for Speech-in-noise Recognition and the Frequency-following Response. Ear Hear 2021; 43:605-619. [PMID: 34619687 DOI: 10.1097/aud.0000000000001122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES The role of subcortical synchrony in speech-in-noise (SIN) recognition and the frequency-following response (FFR) was examined in multiple listeners with auditory neuropathy. Although an absent FFR has been documented in one listener with idiopathic neuropathy who has severe difficulty recognizing SIN, several etiologies cause the neuropathy phenotype. Consequently, it is necessary to replicate absent FFRs and concomitant SIN difficulties in patients with multiple sources and clinical presentations of neuropathy to elucidate fully the importance of subcortical neural synchrony for the FFR and SIN recognition. DESIGN Case series. Three children with auditory neuropathy (two males with neuropathy attributed to hyperbilirubinemia, one female with a rare missense mutation in the OPA1 gene) were compared to age-matched controls with normal hearing (52 for electrophysiology and 48 for speech recognition testing). Tests included standard audiological evaluations, FFRs, and sentence recognition in noise. The three children with neuropathy had a range of clinical presentations, including moderate sensorineural hearing loss, use of a cochlear implant, and a rapid progressive hearing loss. RESULTS Children with neuropathy generally had good speech recognition in quiet but substantial difficulties in noise. These SIN difficulties were somewhat mitigated by a clear speaking style and presenting words in a high semantic context. In the children with neuropathy, FFRs were absent from all tested stimuli. In contrast, age-matched controls had reliable FFRs. CONCLUSION Subcortical synchrony is subject to multiple forms of disruption but results in a consistent phenotype of an absent FFR and substantial difficulties recognizing SIN. These results support the hypothesis that subcortical synchrony is necessary for the FFR. Thus, in healthy listeners, the FFR may reflect subcortical neural processes important for SIN recognition.
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Abstract
Patients with auditory neuropathy (AN)/auditory synaptopathy (AS) present unique evaluation and management challenges. Communication ability using auditory stimuli varies among patients, with particular difficulty understanding speech in noise. Auditory physiologic responses are key to accurate identification and monitoring of patients with AN/AS. Management approaches should consider individual variation and the possibility of change over time. Many patients with accurately characterized AN/AS demonstrate success with cochlear implants. Areas of discovery, including understanding of synaptic and neural mechanisms, genotype/phenotype relationships, and use of cochlear and cortical evoked potentials, will promote accurate clinical evaluation and management of infants, children, and adults with AN/AS.
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Vijayasarathy S, Shetty HN. Perception of temporally enhanced and hearing aid processed speech in children with late-onset Auditory Neuropathy Spectrum Disorder. Int J Pediatr Otorhinolaryngol 2021; 148:110813. [PMID: 34198226 DOI: 10.1016/j.ijporl.2021.110813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 04/13/2021] [Accepted: 06/24/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVE To investigate phrase perception and subjective quality preference of temporal enhancement-based speech processing strategies: Deep-band modulation and Stretching, and hearing aid processed speech in adolescents with late-onset Auditory Neuropathy. METHODS 15 participants with Auditory Neuropathy Spectrum Disorder were involved. Speech perception was assessed using unprocessed, deep-band modulated, stretched, and hearing aid processed conditions. Subjective preference was also assessed using the pair-wise comparison technique. Gap detection test was done using broadband noise to investigate the possible correlation with benefit from processing strategies. RESULTS As a group, no significant benefits were found with processed speech. Clinically relevant trends emerged on subdividing the group into good and poor performers. Deep-band modulation processing was significantly better than unprocessed speech in those with poorer speech recognition abilities. There was a trend for those with poorer temporal processing abilities to benefit more with deep-band modulation processing. In those with relatively better speech recognition abilities, processing showed no benefit, and hearing aid processed speech was inferior to unprocessed speech. Quality-wise, the unprocessed speech was preferred by all the participants. Among the processed conditions, deep-band modulation was preferred by most, followed by stretching and hearing aid processed speech. CONCLUSION Results indicate that temporal enhancement strategies may be beneficial for a subset of individuals with ANSD with poorer temporal processing and speech perception abilities. However, processing strategies need to take into account the quality aspect and not just intelligibility.
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Affiliation(s)
- Srikar Vijayasarathy
- Department of Audiology,JSS Institute of Speech and Hearing, Mysuru- 570004, India.
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Zanin J, Dhollander T, Rance G, Yu L, Lan L, Wang H, Lou X, Connelly A, Nayagam B, Wang Q. Fiber-Specific Changes in White Matter Microstructure in Individuals With X-Linked Auditory Neuropathy. Ear Hear 2021; 41:1703-1714. [PMID: 33136644 DOI: 10.1097/aud.0000000000000890] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES Auditory neuropathy (AN) is the term used to describe a group of hearing disorders, in which the hearing impairment occurs as a result of abnormal auditory nerve function. While our understanding of this condition has advanced significantly over recent years, the ability to determine the site of lesion and the extent of dysfunction in affected individuals remains a challenge. To this end, we investigated potential axonal degeneration in the white matter tracts of the brainstem in individuals with X-linked AN. We hypothesized that individuals with X-linked AN would show focal degeneration within the VIII nerve and/or auditory brainstem tracts, and the degree of degeneration would correlate with the extent of auditory perceptual impairment. DESIGN This was achieved using a higher-order diffusion magnetic resonance imaging (dMRI)-based quantitative measure called apparent fiber density as obtained from a technique called single-shell 3-tissue constrained spherical deconvolution and analyzed with the fixel-based analysis framework. Eleven subjects with genetically confirmed X-linked AN and 11 controls with normal hearing were assessed using behavioral and objective auditory measures. dMRI data were also collected for each participant. RESULTS Fixel-based analysis of the brainstem region showed that subjects with X-linked AN had significantly lower apparent fiber density in the VIII nerve compared with controls, consistent with axonal degeneration in this region. Subsequent analysis of the auditory brainstem tracts specifically showed that degeneration was also significant in these structures overall. The apparent fiber density findings were supported by objective measures of auditory function, such as auditory brainstem responses, electrocochleography, and otoacoustic emissions, which showed VIII nerve activity was severely disrupted in X-linked AN subjects while cochlear sensory hair cell function was relatively unaffected. Moreover, apparent fiber density results were significantly correlated with temporal processing ability (gap detection task) in affected subjects, suggesting that the degree of VIII nerve degeneration may impact the ability to resolve temporal aspects of an acoustic signal. Auditory assessments of sound detection, speech perception, and the processing of binaural cues were also significantly poorer in the X-linked AN group compared with the controls with normal hearing. CONCLUSIONS The results of this study suggest that the dMRI-based measure of apparent fiber density may provide a useful adjunct to existing auditory assessments in the characterization of the site of lesion and extent of dysfunction in individuals with AN. Additionally, the ability to determine the degree of degeneration has the potential to guide rehabilitation strategies in the future.
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Affiliation(s)
- Julien Zanin
- The HEARing Cooperative Research Centre (HEARing CRC), Melbourne, Victoria, Australia
- Department of Audiology and Speech Pathology, University of Melbourne, Parkville, Australia
| | - Thijs Dhollander
- Developmental Imaging, Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Gary Rance
- The HEARing Cooperative Research Centre (HEARing CRC), Melbourne, Victoria, Australia
- Department of Audiology and Speech Pathology, University of Melbourne, Parkville, Australia
| | - Lan Yu
- Department of Otorhinolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital 301, Beijing, China
- China National Clinical Research Centre for Otolaryngologic Diseases, Chinese People's Liberation Army General Hospital 301, Beijing, China
| | - Lan Lan
- Department of Otorhinolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital 301, Beijing, China
- China National Clinical Research Centre for Otolaryngologic Diseases, Chinese People's Liberation Army General Hospital 301, Beijing, China
| | - Hongyang Wang
- Department of Otorhinolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital 301, Beijing, China
- China National Clinical Research Centre for Otolaryngologic Diseases, Chinese People's Liberation Army General Hospital 301, Beijing, China
| | - Xin Lou
- Department of Radiology, Chinese People's Liberation Army General Hospital 301, Beijing, China
| | - Alan Connelly
- The Florey Institute of Neuroscience and Mental Health, Melbourne, Victoria, Australia
- The Florey Department of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Bryony Nayagam
- Department of Audiology and Speech Pathology, University of Melbourne, Parkville, Australia
- These authors contributed equally to this work
| | - Qiuju Wang
- Department of Otorhinolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital 301, Beijing, China
- China National Clinical Research Centre for Otolaryngologic Diseases, Chinese People's Liberation Army General Hospital 301, Beijing, China
- Key Lab of Hearing Impairment Science of Ministry of Education, Beijing, China
- These authors contributed equally to this work
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Cardon G, Sharma A. Cortical Neurophysiologic Correlates of Auditory Threshold in Adults and Children With Normal Hearing and Auditory Neuropathy Spectrum Disorder. Am J Audiol 2021; 30:28-42. [PMID: 33264574 DOI: 10.1044/2020_aja-20-00062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Purpose Auditory threshold estimation using the auditory brainstem response or auditory steady state response is limited in some populations (e.g., individuals with auditory neuropathy spectrum disorder [ANSD] or those who have difficulty remaining still during testing and cannot tolerate general anesthetic). However, cortical auditory evoked potentials (CAEPs) can be recorded in many such patients and have been employed in threshold approximation. Thus, we studied CAEP estimates of auditory thresholds in participants with normal hearing, sensorineural hearing loss, and ANSD. Method We recorded CAEPs at varying intensity levels to speech (i.e., /ba/) and tones (i.e., 1 kHz) to estimate auditory thresholds in normal-hearing adults (n = 10) and children (n = 10) and case studies of children with sensorineural hearing loss and ANSD. Results Results showed a pattern of CAEP amplitude decrease and latency increase as stimulus intensities declined until waveform components disappeared near auditory threshold levels. Overall, CAEP thresholds were within 10 dB HL of behavioral thresholds for both stimuli. Conclusions The above findings suggest that CAEPs may be clinically useful in estimating auditory threshold in populations for whom such a method does not currently exist. Physiologic threshold estimation in difficult-to-test clinical populations could lead to earlier intervention and improved outcomes.
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Affiliation(s)
- Garrett Cardon
- Department of Communication Disorders, Brigham Young University, Provo, UT
| | - Anu Sharma
- Department of Speech, Language, and Hearing Sciences, University of Colorado Boulder
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White-Schwoch T, Krizman J, Nicol T, Kraus N. Case studies in neuroscience: cortical contributions to the frequency-following response depend on subcortical synchrony. J Neurophysiol 2020; 125:273-281. [PMID: 33206575 DOI: 10.1152/jn.00104.2020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Frequency-following responses to musical notes spanning the octave 65-130 Hz were elicited in a person with auditory neuropathy, a disorder of subcortical neural synchrony, and a control subject. No phaselocked responses were observed in the person with auditory neuropathy. The control subject had robust responses synchronized to the fundamental frequency and its harmonics. Cortical onset responses to each note in the series were present in both subjects. These results support the hypothesis that subcortical neural synchrony is necessary to generate the frequency-following response-including for stimulus frequencies at which a cortical contribution has been noted. Although auditory cortex ensembles may synchronize to fundamental frequency cues in speech and music, subcortical neural synchrony appears to be a necessary antecedent.NEW & NOTEWORTHY A listener with auditory neuropathy, an absence of subcortical neural synchrony, did not have electrophysiological frequency-following responses synchronized to an octave of musical notes, with fundamental frequencies ranging from 65 to 130 Hz. A control subject had robust responses that phaselocked to each note. Although auditory cortex may contribute to the scalp-recorded frequency-following response in healthy listeners, our results suggest this phenomenon depends on subcortical neural synchrony.
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Affiliation(s)
- Travis White-Schwoch
- Auditory Neuroscience Laboratory, Department of Communication Sciences, Northwestern University, Evanston, Illinois
| | - Jennifer Krizman
- Auditory Neuroscience Laboratory, Department of Communication Sciences, Northwestern University, Evanston, Illinois
| | - Trent Nicol
- Auditory Neuroscience Laboratory, Department of Communication Sciences, Northwestern University, Evanston, Illinois
| | - Nina Kraus
- Auditory Neuroscience Laboratory, Department of Communication Sciences, Northwestern University, Evanston, Illinois.,Departments of Neurobiology and Otolaryngology, Northwestern University, Evanston, Illinois
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Coding of consonant-vowel transition in children with central auditory processing disorder: an electrophysiological study. Eur Arch Otorhinolaryngol 2020; 278:3673-3681. [PMID: 33052460 DOI: 10.1007/s00405-020-06425-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 10/05/2020] [Indexed: 10/23/2022]
Abstract
INTRODUCTION Acoustic change complex (ACC) is an important tool to investigate the encoding of the acoustic property of speech signals in various populations. However, there is a limited number of research papers that have explored the usefulness of ACC as a tool to study the neural encoding of consonant-vowel (CV) transition in children with central auditory processing disorder (CAPD). Thus, the present study aims to investigate the utility of ACC as an objective tool to study the neural representation of consonant-vowel (CV) transition in children with CAPD. METHODS Twenty children diagnosed having CAPD and 20 normal counterparts in the age range of 8-14 years were the participants. The ACC was acquired using naturally produced CV syllable /sa/ with a duration of 380 ms. RESULTS Latency of N1' and P2' was found to be prolonged in children with CAPD compared to normal counterparts, whereas the amplitude of N1' and P2' did not show any significant difference. Scalp topography showed significantly different activation patterns for children with and without CAPD. CONCLUSION Prolonged latencies of ACC indicated poor encoding of CV transition in children with CAPD. The difference in scalp topography might be because of the involvement of additional brain areas for the neural discrimination task in children with CAPD.
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Erkens J, Schulte M, Vormann M, Herrmann CS. Lacking Effects of Envelope Transcranial Alternating Current Stimulation Indicate the Need to Revise Envelope Transcranial Alternating Current Stimulation Methods. Neurosci Insights 2020; 15:2633105520936623. [PMID: 32685924 PMCID: PMC7343360 DOI: 10.1177/2633105520936623] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 05/28/2020] [Indexed: 12/13/2022] Open
Abstract
In recent years, several studies have reported beneficial effects of transcranial alternating current stimulation (tACS) in experiments regarding sound and speech perception. A new development in this field is envelope-tACS: The goal of this method is to improve cortical entrainment to the speech signal by stimulating with a waveform based on the speech envelope. One challenge of this stimulation method is timing; the electrical stimulation needs to be phase-aligned with the naturally occurring cortical entrainment to the auditory stimuli. Due to individual differences in anatomy and processing speed, the optimal time-lag between presentation of sound and applying envelope-tACS varies between participants. To better investigate the effects of envelope-tACS, we performed a speech comprehension task with a larger amount of time-lags than previous experiments, as well as an equal amount of sham conditions. No significant difference between optimal stimulation time-lag condition and best sham condition was found. Further investigation of the data revealed a significant difference between the positive and negative half-cycles of the stimulation conditions but not for sham. However, we also found a significant learning effect over the course of the experiment which was of comparable size to the effects of envelope-tACS found in previous auditory tACS studies. In this article, we discuss possible explanations for why our findings did not match up with those of previous studies and the issues that come with researching and developing envelope-tACS.
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Affiliation(s)
- Jules Erkens
- Experimental Psychology Lab, Department of Psychology, Cluster of Excellence 'Hearing4All', European Medical School, Carl von Ossietzky University of Oldenburg, Oldenburg, Germany
| | | | | | - Christoph S Herrmann
- Experimental Psychology Lab, Department of Psychology, Cluster of Excellence 'Hearing4All', European Medical School, Carl von Ossietzky University of Oldenburg, Oldenburg, Germany.,Research Center Neurosensory Science, Carl von Ossietzky University of Oldenburg, Oldenburg, Germany
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McFayden TC, Baskin P, Stephens JDW, He S. Cortical Auditory Event-Related Potentials and Categorical Perception of Voice Onset Time in Children With an Auditory Neuropathy Spectrum Disorder. Front Hum Neurosci 2020; 14:184. [PMID: 32523521 PMCID: PMC7261872 DOI: 10.3389/fnhum.2020.00184] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 04/27/2020] [Indexed: 11/13/2022] Open
Abstract
Objective: This study evaluated cortical encoding of voice onset time (VOT) in quiet and noise, and their potential associations with the behavioral categorical perception of VOT in children with auditory neuropathy spectrum disorder (ANSD). Design: Subjects were 11 children with ANSD ranging in age between 6.4 and 16.2 years. The stimulus was an /aba/-/apa/ vowel-consonant-vowel continuum comprising eight tokens with VOTs ranging from 0 ms (voiced endpoint) to 88 ms (voiceless endpoint). For speech in noise, speech tokens were mixed with the speech-shaped noise from the Hearing In Noise Test at a signal-to-noise ratio (SNR) of +5 dB. Speech-evoked auditory event-related potentials (ERPs) and behavioral categorization perception of VOT were measured in quiet in all subjects, and at an SNR of +5 dB in seven subjects. The stimuli were presented at 35 dB SL (re: pure tone average) or 115 dB SPL if this limit was less than 35 dB SL. In addition to the onset response, the auditory change complex (ACC) elicited by VOT was recorded in eight subjects. Results: Speech evoked ERPs recorded in all subjects consisted of a vertex positive peak (i.e., P1), followed by a trough occurring approximately 100 ms later (i.e., N2). For results measured in quiet, there was no significant difference in categorical boundaries estimated using ERP measures and behavioral procedures. Categorical boundaries estimated in quiet using both ERP and behavioral measures closely correlated with the most-recently measured Phonetically Balanced Kindergarten (PBK) scores. Adding a competing background noise did not affect categorical boundaries estimated using either behavioral or ERP procedures in three subjects. For the other four subjects, categorical boundaries estimated in noise using behavioral measures were prolonged. However, adding background noise only increased categorical boundaries measured using ERPs in three out of these four subjects. Conclusions: VCV continuum can be used to evaluate behavioral identification and the neural encoding of VOT in children with ANSD. In quiet, categorical boundaries of VOT estimated using behavioral measures and ERP recordings are closely associated with speech recognition performance in children with ANSD. Underlying mechanisms for excessive speech perception deficits in noise may vary for individual patients with ANSD.
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Affiliation(s)
- Tyler C McFayden
- Department of Psychology, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - Paola Baskin
- Department of Anesthesiology, School of Medicine, University of California, San Diego, San Diego, CA, United States
| | - Joseph D W Stephens
- Department of Psychology, North Carolina Agricultural and Technical State University, Greensboro, NC, United States
| | - Shuman He
- Department of Otolaryngology-Head and Neck Surgery, Wexner Medical Center, The Ohio State University, Columbus, OH, United States.,Department of Audiology, Nationwide Children's Hospital, Columbus, OH, United States
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Roman AN, Runge CL. Update on Auditory Neuropathy/Dyssynchrony in Children. CURRENT OTORHINOLARYNGOLOGY REPORTS 2020. [DOI: 10.1007/s40136-020-00297-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Auditory Neuropathy Spectrum Disorders: From Diagnosis to Treatment: Literature Review and Case Reports. J Clin Med 2020; 9:jcm9041074. [PMID: 32290039 PMCID: PMC7230308 DOI: 10.3390/jcm9041074] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/21/2020] [Accepted: 04/01/2020] [Indexed: 12/21/2022] Open
Abstract
Auditory neuropathy spectrum disorder (ANSD) refers to a range of hearing impairments characterized by deteriorated speech perception, despite relatively preserved pure-tone detection thresholds. Affected individuals usually present with abnormal auditory brainstem responses (ABRs), but normal otoacoustic emissions (OAEs). These electrophysiological characteristics have led to the hypothesis that ANSD may be caused by various dysfunctions at the cochlear inner hair cell (IHC) and spiral ganglion neuron (SGN) levels, while the activity of outer hair cells (OHCs) is preserved, resulting in discrepancies between pure-tone and speech comprehension thresholds. The exact prevalence of ANSD remains unknown; clinical findings show a large variability among subjects with hearing impairment ranging from mild to profound hearing loss. A wide range of prenatal and postnatal etiologies have been proposed. The study of genetics and of the implicated sites of lesion correlated with clinical findings have also led to a better understanding of the molecular mechanisms underlying the various forms of ANSD, and may guide clinicians in better screening, assessment and treatment of ANSD patients. Besides OAEs and ABRs, audiological assessment includes stapedial reflex measurements, supraliminal psychoacoustic tests, electrocochleography (ECochG), auditory steady-state responses (ASSRs) and cortical auditory evoked potentials (CAEPs). Hearing aids are indicated in the treatment of ANSD with mild to moderate hearing loss, whereas cochlear implantation is the first choice of treatment in case of profound hearing loss, especially in case of IHC presynaptic disorders, or in case of poor auditory outcomes with conventional hearing aids.
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Yüksel M, Çiprut A. Music and psychoacoustic perception abilities in cochlear implant users with auditory neuropathy spectrum disorder. Int J Pediatr Otorhinolaryngol 2020; 131:109865. [PMID: 31945735 DOI: 10.1016/j.ijporl.2020.109865] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 01/05/2020] [Accepted: 01/05/2020] [Indexed: 10/25/2022]
Abstract
OBJECTIVE Auditory neuropathy spectrum disorder (ANSD) is a condition wherein the pre-neural or cochlear outer hair cell activity is intact, but the neural activity in the auditory nerve is disrupted. Cochlear implant (CI) can be beneficial for subjects with ANSD; however, little is known about the music perception and psychoacoustic abilities of CI users with ANSD. Music perception in CI users is a multidimensional and complex ability requiring the contribution of both auditory and nonauditory abilities. Even though auditory abilities lay the foundation, the contribution of patient-related variables such as ANSD may affect the music perception. This study aimed to evaluate the psychoacoustic and music perception abilities of CI recipients with ANSD. STUDY DESIGN Twelve CI users with ANSD and twelve age- and gendermatched CI users with sensorineural hearing loss (SNHL) were evaluated. Music perception abilities were measured using the Turkish version of the Clinical Assessment of Music Perception (T-CAMP) test. Psychoacoustic abilities were measured using the spectral ripple discrimination (SRD) and temporal modulation transfer function (TMTF) tests. In addition, the age of diagnosis and implantation was recorded. RESULTS Pitch direction discrimination (PDD), timbre recognition, SRD, and TMTF performance of CI users with ANSD were concordant with those reported in previous studies, and differences between ANSD and SNHL groups were not statistically significant. However, the ANSD group performed poorly compared with SNHL group in melody recognition subtest of T-CAMP, and the difference was statistically significant. CONCLUSION CI can prove beneficial for patients with ANSD with respect to their music and psychoacoustic abilities, similar to patients with SNHL, except for melody recognition. Recognition of melodies requires both auditory and non-auditory abilities, and ANSD may have an extensive but subtle effect in the life of CI users.
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Affiliation(s)
- Mustafa Yüksel
- Marmara University, Institute of Health Sciences, Audiology and Speech Disorders Program, İstanbul, Turkey.
| | - Ayça Çiprut
- Marmara University Faculty of Medicine, Audiology Department, İstanbul, Turkey
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Jaha N, Shen S, Kerlin JR, Shahin AJ. Visual Enhancement of Relevant Speech in a 'Cocktail Party'. Multisens Res 2020; 33:277-294. [PMID: 32508080 DOI: 10.1163/22134808-20191423] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Lip-reading improves intelligibility in noisy acoustical environments. We hypothesized that watching mouth movements benefits speech comprehension in a 'cocktail party' by strengthening the encoding of the neural representations of the visually paired speech stream. In an audiovisual (AV) task, EEG was recorded as participants watched and listened to videos of a speaker uttering a sentence while also hearing a concurrent sentence by a speaker of the opposite gender. A key manipulation was that each audio sentence had a 200-ms segment replaced by white noise. To assess comprehension, subjects were tasked with transcribing the AV-attended sentence on randomly selected trials. In the auditory-only trials, subjects listened to the same sentences and completed the same task while watching a static picture of a speaker of either gender. Subjects directed their listening to the voice of the gender of the speaker in the video. We found that the N1 auditory-evoked potential (AEP) time-locked to white noise onsets was significantly more inhibited for the AV-attended sentences than for those of the auditorily-attended (A-attended) and AV-unattended sentences. N1 inhibition to noise onsets has been shown to index restoration of phonemic representations of degraded speech. These results underscore that attention and congruency in the AV setting help streamline the complex auditory scene, partly by reinforcing the neural representations of the visually attended stream, heightening the perception of continuity and comprehension.
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Affiliation(s)
- Niti Jaha
- 1Center for Mind and Brain, University of California, Davis, 95618, USA
| | - Stanley Shen
- 1Center for Mind and Brain, University of California, Davis, 95618, USA
| | - Jess R Kerlin
- 1Center for Mind and Brain, University of California, Davis, 95618, USA
| | - Antoine J Shahin
- 1Center for Mind and Brain, University of California, Davis, 95618, USA.,2Department of Cognitive and Information Sciences, University of California, Merced, CA 95343, USA
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Pitchaimuthu A, Kanagokar V, Grama Bhagavan S, Bhat JS. Effect of inter-aural modulation depth difference on interaural time difference thresholds for speech: An observational study. F1000Res 2020; 9:115. [PMID: 32765838 PMCID: PMC7383721 DOI: 10.12688/f1000research.21379.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/28/2020] [Indexed: 11/21/2022] Open
Abstract
Background: The temporal envelope (ENV) plays a vital role in conveying inter-aural time difference (ITD) in many clinical populations. However, the presence of background noise and electronic features, such as compression, reduces the modulation depth of ENV to a different degree in both ears. The effect of ENV modulation depth differences between the ears on ITD thresholds is unknown; therefore, this was the aim of the current study’s investigation. Methods: Six normally hearing young adults (age range 20-30 years) participated in the current study. Six vowel-consonant-vowel (VCV) (/aka/, /aga/, /apa/, /aba/, /ata/, /ada/) tokens were used as the probe stimuli. ENV depth of VCV tokens was smeared by 0%, 29%, and 50%, which results in 100%, 71%, and 50% of the original modulation depth. ITD thresholds were estimated as a function of the difference in temporal ENV depth between the ears, wherein in one ear the modulation depth was retained at 100% and in the other ear, the modulation depth was changed to 100%, 71%, and 50%. Results: Repeated measures of ANOVA revealed a significant main effect of interaural modulation depth differences on the ITD threshold (F(2,10)= 9.04, p= 0.006). ITD thresholds increased with an increase in the inter-aural modulation depth difference. Conclusion: Inter-aural ENV depth is critical for ITD perception.
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Affiliation(s)
- Arivudainambi Pitchaimuthu
- Department of Audiology and Speech Language Pathology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, Mangaluru, Karnataka, 575001, India
| | - Vibha Kanagokar
- Department of Audiology and Speech Language Pathology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, Mangaluru, Karnataka, 575001, India
| | - Srividya Grama Bhagavan
- Department of Audiology, Trustwell Hospital Pvt. Limited, Bangalore, Karnataka, 560002, India
| | - Jayashree S Bhat
- Department of Audiology and Speech Language Pathology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, Mangaluru, Karnataka, 575001, India
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Radziwon KE, Sheppard A, Salvi RJ. Psychophysical changes in temporal processing in chinchillas with noise-induced hearing loss: A literature review. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2019; 146:3733. [PMID: 31795701 DOI: 10.1121/1.5132292] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
It is well-established that excessive noise exposure can systematically shift audiometric thresholds (i.e., noise-induced hearing loss, NIHL) making sounds at the lower end of the dynamic range difficult to detect. An often overlooked symptom of NIHL is the degraded ability to resolve temporal fluctuations in supra-threshold signals. Given that the temporal properties of speech are highly dynamic, it is not surprising that NIHL greatly reduces one's ability to clearly decipher spoken language. However, systematic characterization of noise-induced impairments on supra-threshold signals in humans is difficult given the variability in noise exposure among individuals. Fortunately, the chinchilla is audiometrically similar to humans, making it an ideal animal model to investigate noise-induced supra-threshold deficits. Through a series of studies using the chinchilla, the authors have elucidated several noise-induced deficits in temporal processing that occur at supra-threshold levels. These experiments highlight the importance of the chinchilla model in developing an understanding of noise-induced deficits in temporal processing.
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Affiliation(s)
- Kelly E Radziwon
- Center for Hearing & Deafness, Department of Communicative Disorders and Sciences, State University of New York at Buffalo, 137 Cary Hall, Buffalo, New York 14214, USA
| | - Adam Sheppard
- Department of Communicative Disorders and Sciences, State University of New York at Buffalo, 137 Cary Hall, Buffalo, New York 14214, USA
| | - Richard J Salvi
- Center for Hearing & Deafness, Department of Communicative Disorders and Sciences, State University of New York at Buffalo, 137 Cary Hall, Buffalo, New York 14214, USA
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Atilgan A, Yuksel M, Ciprut A. Cochlear Implantation in a Case of Auditory Neuropathy Spectrum Disorder with CAPOS Syndrome. Medeni Med J 2019; 34:318-323. [PMID: 32821455 PMCID: PMC7433731 DOI: 10.5222/mmj.2019.53503] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 08/14/2019] [Indexed: 11/29/2022] Open
Abstract
Auditory neuropathy spectrum disorder (ANSD) is a hearing disorder which characterized with normal outer hair cell function but disrupted neural synchrony in the afferent auditory pathway. CAPOS (cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss) syndrome can manifest itself with ANSD and this rare situation and audiological rehabilitation outcomes have not well documented in the literature. We aim to present a cochlear implant user subject with CAPOS syndrome and ANSD. A 14-year-old girl diagnosed with ANSD and CAPOS syndrome. She received unilateral cochlear implant (CI). Her hearing sensitivity and speech perception abilities have been improved with CI. Also, she has a good music perception ability measured with the Turkish version of Clinical Assessment of Music Perception Test. After detailed audiological evaluations, CI could be a good option for patients who have ANSD and CAPOS syndrome.
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Affiliation(s)
- Atılım Atilgan
- Marmara University, Department of Audiology, Istanbul, Turkey
| | - Mustafa Yuksel
- Marmara University, Department of Audiology, İstanbul, Turkey
| | - Ayca Ciprut
- Marmara University, Department of Audiology, İstanbul, Turkey
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White-Schwoch T, Anderson S, Krizman J, Nicol T, Kraus N. Case studies in neuroscience: subcortical origins of the frequency-following response. J Neurophysiol 2019; 122:844-848. [DOI: 10.1152/jn.00112.2019] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The auditory frequency-following response (FFR) reflects synchronized and phase-locked activity along the auditory pathway in response to sound. Although FFRs were historically thought to reflect subcortical activity, recent evidence suggests an auditory cortex contribution as well. Here we present electrophysiological evidence for the FFR’s origins from two cases: a patient with bilateral auditory cortex lesions and a patient with auditory neuropathy, a condition of subcortical origin. The patient with auditory cortex lesions had robust and replicable FFRs, but no cortical responses. In contrast, the patient with auditory neuropathy had no FFR despite robust and replicable cortical responses. This double dissociation shows that subcortical synchrony is necessary and sufficient to generate an FFR. NEW & NOTEWORTHY The frequency-following response (FFR) reflects synchronized and phase-locked neural activity in response to sound. The authors present a dual case study, comparing FFRs and cortical potentials between a patient with auditory neuropathy (a condition of subcortical origin) and a patient with bilateral auditory cortex lesions. They show that subcortical synchrony is necessary and sufficient to generate an FFR.
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Affiliation(s)
- Travis White-Schwoch
- Auditory Neuroscience Laboratory, Department of Communication Sciences, Northwestern University, Evanston, Illinois
| | - Samira Anderson
- Department of Hearing and Speech Sciences, University of Maryland College Park, College Park, Maryland
| | - Jennifer Krizman
- Auditory Neuroscience Laboratory, Department of Communication Sciences, Northwestern University, Evanston, Illinois
| | - Trent Nicol
- Auditory Neuroscience Laboratory, Department of Communication Sciences, Northwestern University, Evanston, Illinois
| | - Nina Kraus
- Auditory Neuroscience Laboratory, Department of Communication Sciences, Northwestern University, Evanston, Illinois
- Department of Neurobiology, Northwestern University, Evanston, Illinois
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32
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Giuliani N, Holte L, Shy M, Grider T. The audiologic profile of patients with Charcot-Marie Tooth neuropathy can be characterised by both cochlear and neural deficits. Int J Audiol 2019; 58:902-912. [PMID: 31318300 DOI: 10.1080/14992027.2019.1633022] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Objective: The primary goal of this study was to characterise the cochlear and neural components of hearing loss in a large cohort of people with Charcot-Marie Tooth neuropathy who reported hearing difficulties.Design: A full complement of audiologic measures including behavioral, physiologic and subjective assessments were administered.Study sample: Seventy-nine participants completed the study. Forty-four people had CMT1, 27 had CMT2 and four had CMT-INT.Results: Pure tone average was related to age and the absence of high-frequency DPOAE energy, suggesting a strong cochlear component. Acoustic reflexes were often elevated or absent and many participants exhibited abnormal ABR waveforms, suggesting additional neural hearing loss components. Participants with an abnormal or absent ABR wave V exhibited poorer speech perception abilities. There was an association between a prolonged ABR wave I latency and an abnormal or absent ABR wave V with a higher Charcot-Marie Tooth Neuropathy Score (indicating greater disability).Conclusions: The hearing abilities of people with CMT are highly variable. While there were strong neural hearing loss components, speech perception abilities were not disproportionately affected in most participants. Therefore, a hearing aid trial is recommended. ABR responses may be a useful tool for monitoring the progression of CMT over time.
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Affiliation(s)
- Nicholas Giuliani
- Department of Otolaryngology, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Lenore Holte
- Department of Communications Sciences and Disorders, University of Iowa, Iowa City, IA, USA.,Center for Disabilities and Development, University Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Michael Shy
- Department of Neurology, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Tiffany Grider
- Department of Neurology, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
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33
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Tone frequency representation beyond the tonotopic map: Cross-correlation between ongoing activity in the rat auditory cortex. Neuroscience 2019; 409:35-42. [PMID: 31026562 DOI: 10.1016/j.neuroscience.2019.04.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 04/09/2019] [Accepted: 04/11/2019] [Indexed: 11/21/2022]
Abstract
Functional maps play crucial roles in the neural representations of the sensory cortices, although such representations occasionally extend beyond these maps. For example, the auditory cortex exhibits distinct tonotopic activation at the onset of tone, which is followed by rapid decays in the majority of neuronal signals and ongoing activities in only a small number of neurons. Such ongoing activity should be maintained by the cortical states. To better understand maintenance of ongoing activity beyond that triggered directly by stimuli, we used a rat model. Here, we hypothesized that neural correlations between local field potentials (LFPs) within a local area of the auditory cortex may serve as a measure of the cortical state underlying ongoing activity. We densely mapped the auditory cortex of rats and demonstrated that cross-correlation patterns of ongoing activity were highly decodable. Informative features were widely distributed over the auditory cortex and across multiple frequency bands. Furthermore, acoustic trauma disrupted tonotopic representation at the onset but did not affect neural representations by the correlation of ongoing activities. These results suggest that cross-correlations of LFP within the auditory cortex represent frequencies of sustained auditory stimuli, and that these representations are made beyond direct tonotopic activation at stimulus onset.
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34
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Burghard AL, Morel NP, Oliver DL. Mice heterozygous for the Cdh23/Ahl1 mutation show age-related deficits in auditory temporal processing. Neurobiol Aging 2019; 81:47-57. [PMID: 31247458 DOI: 10.1016/j.neurobiolaging.2019.02.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 01/15/2019] [Accepted: 02/03/2019] [Indexed: 11/28/2022]
Abstract
A mutation in the Cdh23 gene is implicated in both syndromic and nonsyndromic hearing loss in humans and age-related hearing loss in C57BL/6 mice. It is generally assumed that human patients (as well as mouse models) only have a hearing loss phenotype if the mutation is homozygous. However, a major complaint for patients with a hearing disability is a reduced speech intelligibility that may be related to temporal processing deficits rather than just elevated thresholds. In this study, we used the amplitude modulation following response (AMFR) to test whether mice heterozygous for Cdh23735A > G have an auditory phenotype that includes temporal processing deficits. The hearing of mice heterozygous for the Cdh23735A > G mutation was compared with age-matched mice homozygous for either the mutation or the wild type in 3 cohorts of mice of both sexes at 2-3, 6, and 12 months of age. The AMFR technique was used to generate objective hearing thresholds for all mice across their range of hearing and to test their temporal processing. We found a genotype-dependent hearing loss in mice homozygous for the mutation starting at 5-11 weeks of age, an age when mice on the C57BL/6 background are often presumed to have normal hearing. The heterozygous animals retained normal hearing thresholds up to one year of age. Nevertheless, the heterozygous animals showed a decline in temporal processing abilities at one year of age that was independent of their hearing thresholds. These results suggest that mice heterozygous for the Cdh23 mutation do not have truly normal hearing.
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Affiliation(s)
- Alice L Burghard
- Department of Neuroscience, University of Connecticut School of Medicine, Farmington, CT, USA
| | - Nazli P Morel
- Department of Neuroscience, University of Connecticut School of Medicine, Farmington, CT, USA
| | - Douglas L Oliver
- Department of Neuroscience, University of Connecticut School of Medicine, Farmington, CT, USA.
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Devaraju DS, Maruthy S, Kumar AU. Detection of Gap and Modulations: Auditory Temporal Resolution Deficits in Adults Who Stutter. Folia Phoniatr Logop 2019; 72:13-21. [PMID: 31132766 DOI: 10.1159/000499565] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 03/12/2019] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Recent models of speech production suggest a link between speech production and perception. Persons with stuttering are known to have deficits in sensorimotor timing and exhibit auditory processing problems. Most of the earlier studies have focused on assessing temporal ordering in adults who stutter (AWS), but limited attempts have been made to document temporal resolution abilities in AWS. METHODS A group of 16 AWS and 16 age- and gender-matched adults who do not stutter (AWNS) were recruited for the study. Temporal resolution abilities were assessed using the Gap Detection Test and temporal modulation transfer function (TMTF). RESULTS The results revealed significant differences in TMTF between AWS and AWNS, but no differences were found in the gap detection thresholds. CONCLUSIONS Results suggest that the sensory representations of the temporal modulations are compromised in AWS, which may contribute to the programming of rhythmic movements during speech planning.
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Affiliation(s)
- Dhatri S Devaraju
- Department of Audiology, All India Institute of Speech and Hearing, Manasagangothri, Mysuru, India,
| | - Santosh Maruthy
- Department of Speech Language Sciences, All India Institute of Speech and Hearing, Manasagangothri, Mysuru, India
| | - Ajith U Kumar
- Department of Audiology, All India Institute of Speech and Hearing, Manasagangothri, Mysuru, India
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Cost of auditory sharpness: Model-Based estimate of energy use by auditory brainstem "octopus" neurons. J Theor Biol 2019; 469:137-147. [PMID: 30831173 DOI: 10.1016/j.jtbi.2019.01.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 01/07/2019] [Accepted: 01/21/2019] [Indexed: 11/21/2022]
Abstract
Octopus cells (OCs) of the mammalian auditory brainstem precisely encode timing of fast transient sounds and tone onsets. Sharp temporal fidelity of OCs relies on low resting membrane resistance, which suggests high energy expenditure on maintaining ion gradients across plasma membrane. We provide a model-based estimate of energy consumption in resting and spiking OCs. Our results predict that a resting OC consumes up to 2.6 × 109 ATP molecules (ATPs) per second which remarkably exceeds energy consumption of other CNS neurons. Glucose usage by all OCs in the rat is nevertheless low due to their low number. Major part of the OCs energy use results from the ion mechanisms providing for the low membrane resistance: hyperpolarization-activated mixed cation conductance and low-voltage activated K+-conductance. Spatially ordered synapses-a feature of the OCs allowing them to compensate for asynchrony of the synaptic input-brings only a 12% energy saving to OCs excitability cost. Only 13% of total OC energy used for an AP generation (1.5 × 107 ATPs) is associated with the AP generation in the axon initial segment, 64%-with synaptic currents processing and 23%-with keeping resting potential.
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Abstract
OBJECTIVE The temporal modulation transfer function (TMTF) has been proposed to estimate the temporal resolution abilities of listeners with normal hearing and listeners with hearing loss. The TMTF data of patients would be useful for clinical diagnosis and for adjusting the hearing instruments at clinical and fitting sites. However, practical application is precluded by the long measurement time of the conventional method, which requires several measurement points. This article presents a new method to measure the TMTF that requires only two measurement points. DESIGN Experiments were performed to estimate the TMTF of normal listeners and listeners with hearing loss to demonstrate that the two-point method can estimate the TMTF parameter and the conventional method. Sixteen normal hearing and 21 subjects with hearing loss participated, and the difference between the estimated TMTF parameters and measurement time were compared. RESULTS The TMTF parameters (the peak sensitivity Lps and cutoff frequency fcutoff) estimated by the conventional and two-point methods showed significantly high correlations: the correlation coefficient for Lps was 0.91 (t(45) = 14.3; p < 10) and that for fcutoff was 0.89 (t(45) = 13.2; p < 10). There were no fixed and proportional biases. Therefore, the estimated values were in good agreement. Moreover, there was no systematic bias depending on the subject's profile. The measurement time of the two-point method was approximately 10 min, which is approximately one-third that of the conventional method. CONCLUSION The two-point method enables the introduction of TMTF measurement in clinical diagnosis.
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Alzhrani F, Yousef M, Almuhawas F, Almutawa H. Auditory and speech performance in cochlear implanted ANSD children. Acta Otolaryngol 2019; 139:279-283. [PMID: 30947614 DOI: 10.1080/00016489.2019.1571283] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
BACKGROUND Auditory neuropathy spectrum disorder (ANSD) is a distinct type of SNHL that is characterized by the presence of otoacoustic emissions and/or cochlear microphonics. Cochlear implantation was initially not recommended for ANSD children, later studies showed variable outcomes among those subjects. OBJECTIVE To assess the auditory and speech performance of cochlear implanted children with auditory neuropathy spectrum disorder (ANSD) and to compare these results to those obtained from cochlear implanted children with sensorineural hearing loss (SNHL) Material and methods: 18 cochlear implanted children with ANSD and 40 cochlear implanted children with SNHL were included in this study. Auditory and speech performance results were compared across both subject groups using the Category of Auditory Performance (CAP) and Speech Intelligibility Rate (SIR) tests, with measurements recorded one year post implantation. RESULTS Cochlear implanted children with ANSD showed clinically significant improvements that were comparable to those observed from cochlear implanted subjects without ANSD. CONCLUSIONS Children with ANSD benefit from early cochlear implantation and can reach similar auditory and speech performance results as that achieved by children without ANSD.
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Affiliation(s)
- Farid Alzhrani
- King Abdullah Ear Specialist Center (KAESC), College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Medhat Yousef
- King Abdullah Ear Specialist Center (KAESC), College of Medicine, King Saud University, Riyadh, Saudi Arabia
- Audiology Unit, ENT Department, Faculty of Medicine, Menoufia University, Al Menoufia, Egypt
| | - Fida Almuhawas
- King Abdullah Ear Specialist Center (KAESC), College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Hisham Almutawa
- ENT Surgery Unit, Department of Surgical Specialists, King Fahad Medical City, Riyadh, Saudi Arabia
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Ralli M, Greco A, De Vincentiis M, Sheppard A, Cappelli G, Neri I, Salvi R. Tone-in-noise detection deficits in elderly patients with clinically normal hearing. Am J Otolaryngol 2019; 40:1-9. [PMID: 30327149 DOI: 10.1016/j.amjoto.2018.09.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 09/13/2018] [Accepted: 09/16/2018] [Indexed: 01/25/2023]
Abstract
PURPOSE One of the most common complaints among the elderly is the inability to understand speech in noisy environments. In many cases, these deficits are due to age-related hearing loss; however, some of the elderly that have difficulty hearing in noise have clinically normal pure-tone thresholds. While speech in noise testing is informative, it fails to identify specific frequencies responsible for the speech processing deficit. Auditory neuropathy patients and animal models of hidden hearing loss suggest that tone-in-noise thresholds may provide frequency specific information for those patients who express difficulty, but have normal thresholds in quiet. Therefore, we aimed to determine if tone-in-noise thresholds could be a useful measure in detecting age-related hearing deficits, despite having normal audiometric thresholds. MATERIALS & METHODS We tested this hypothesis by measuring tone-in-noise thresholds in 11 Old (62.4 ± 5 years) and 21 Young (23.1 ± 2.2 years) patients with clinically normal thresholds. Tone thresholds were measured in a quite sound field, then in 20, 30 and 40 dB HL broadband noise. RESULTS Despite having normal hearing (thresholds ≤25 dB HL), the Old patients had significantly worse tone-in-noise thresholds than the Young patients at 0.125, 4, and 8 kHz. Linear regression analysis showed that the growth of masking in Old and Young patients was nearly identical at all frequencies. However, the amount of masking at low and high frequencies was typically 10-18 dB greater in the Old patients compared to the Young, except near 1 kHz. The frequency-dependent changes in masking are discussed in the context of a "line busy" model and temporal bone studies of auditory nerve fiber loss.
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Choi JE, Seok JM, Ahn J, Ji YS, Lee KM, Hong SH, Choi BO, Moon IJ. Hidden hearing loss in patients with Charcot-Marie-Tooth disease type 1A. Sci Rep 2018; 8:10335. [PMID: 29985472 PMCID: PMC6037750 DOI: 10.1038/s41598-018-28501-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 06/20/2018] [Indexed: 12/30/2022] Open
Abstract
The aim of this study was to investigate hidden hearing loss in patients with Charcot-Marie-Tooth disease type 1 A (CMT1A), a common inherited demyelinating neuropathy. By using pure-tone audiometry, 43 patients with CMT1A and 60 healthy controls with normal sound detection abilities were enrolled. Speech perception in quiet and noisy backgrounds, spectral ripple discrimination (SRD), and temporal modulation detection (TMD) were measured. Although CMT1A patients and healthy controls had similar pure-tone thresholds and speech perception scores in a quiet background, CMT1A patients had significantly (p < 0.05) decreased speech perception ability in a noisy background compared to controls. CMT1A patients showed significantly decreased temporal and spectral resolution (both p < 0.05). Also, auditory temporal processing of CMT1A patients was correlated with speech perception in a noisy background (r = 0.447, p < 0.01) and median motor conduction velocity (r = 0.335, p < 0.05). Therefore, we assumed that demyelination of auditory nerve in CMT1A causes defective cochlear neurotransmission, which reduces temporal resolution and speech perception in a noisy background. Because the temporal resolution test was well correlated with the degree of demyelination in auditory and peripheral motor nerves, temporal resolution testing could be performed as an additional marker for CMT1A.
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Affiliation(s)
- Ji Eun Choi
- Department of Otorhinolaryngology - Head and Neck Surgery, Dankook University Hospital, Cheonan, Republic of Korea
| | - Jin Myoung Seok
- Department of Neurology, Soonchunhyang University Cheonan Hospital, Soonchunhyang University College of Medicine, Cheonan, Korea
| | - Jungmin Ahn
- Department of Otorhinolaryngology - Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Yoon Sang Ji
- Hearing Research Laboratory, Samsung Medical Center, Changwon, Republic of Korea
| | - Kyung Myun Lee
- School of Humanities and Social Sciences, KAIST, Changwon, Republic of Korea
| | - Sung Hwa Hong
- Department of Otorhinolaryngology - Head and Neck Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Republic of Korea
| | - Byung-Ok Choi
- Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
| | - Il Joon Moon
- Department of Otorhinolaryngology - Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
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White-Schwoch T, Nicol T, Warrier CM, Abrams DA, Kraus N. Individual Differences in Human Auditory Processing: Insights From Single-Trial Auditory Midbrain Activity in an Animal Model. Cereb Cortex 2018; 27:5095-5115. [PMID: 28334187 DOI: 10.1093/cercor/bhw293] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 08/29/2016] [Indexed: 11/13/2022] Open
Abstract
Auditory-evoked potentials are classically defined as the summations of synchronous firing along the auditory neuraxis. Converging evidence supports a model whereby timing jitter in neural coding compromises listening and causes variable scalp-recorded potentials. Yet the intrinsic noise of human scalp recordings precludes a full understanding of the biological origins of individual differences in listening skills. To delineate the mechanisms contributing to these phenomena, in vivo extracellular activity was recorded from inferior colliculus in guinea pigs to speech in quiet and noise. Here we show that trial-by-trial timing jitter is a mechanism contributing to auditory response variability. Identical variability patterns were observed in scalp recordings in human children, implicating jittered timing as a factor underlying reduced coding of dynamic speech features and speech in noise. Moreover, intertrial variability in human listeners is tied to language development. Together, these findings suggest that variable timing in inferior colliculus blurs the neural coding of speech in noise, and propose a consequence of this timing jitter for human behavior. These results hint both at the mechanisms underlying speech processing in general, and at what may go awry in individuals with listening difficulties.
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Affiliation(s)
- Travis White-Schwoch
- Auditory Neuroscience Laboratory (www.brainvolts.northwestern.edu) & Department of Communication Sciences, Northwestern University, Evanston, IL, 60208, USA
| | - Trent Nicol
- Auditory Neuroscience Laboratory (www.brainvolts.northwestern.edu) & Department of Communication Sciences, Northwestern University, Evanston, IL, 60208, USA
| | - Catherine M Warrier
- Auditory Neuroscience Laboratory (www.brainvolts.northwestern.edu) & Department of Communication Sciences, Northwestern University, Evanston, IL, 60208, USA
| | - Daniel A Abrams
- Auditory Neuroscience Laboratory (www.brainvolts.northwestern.edu) & Department of Communication Sciences, Northwestern University, Evanston, IL, 60208, USA.,Stanford Cognitive & Systems Neuroscience Laboratory, Stanford University, Palo Alto, CA, 94304, USA
| | - Nina Kraus
- Auditory Neuroscience Laboratory (www.brainvolts.northwestern.edu) & Department of Communication Sciences, Northwestern University, Evanston, IL, 60208, USA.,Department of Neurobiology & Physiology, Northwestern University, Evanston, IL, 60208, USA.,Department of Otolaryngology, Northwestern University, Chicago, IL, 60611, USA
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Cochlear Implantation in Charcot-Marie-Tooth Disease: Case Report and Review of the Literature. Case Rep Med 2018; 2018:1760978. [PMID: 29780422 PMCID: PMC5892247 DOI: 10.1155/2018/1760978] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 03/08/2018] [Indexed: 11/24/2022] Open
Abstract
Introduction Charcot-Marie-Tooth (CMT) disease is a peripheral hereditary neuropathy associated with motor and sensory impairment and can result in profound sensorineural hearing loss (SNHL). Currently, the role of cochlear implantation in the setting of CMT and other progressive peripheral neurodegenerative disorders is not well established. Methods Case report and review of the English literature. Results A 70-year-old male with CMT was referred for evaluation of progressive asymmetric SNHL and reported a 15-year duration of deafness involving the left ear. Audiometric testing confirmed profound SNHL in the left ear, while the right ear exhibited moderate-to-severe SNHL. Left-sided cochlear implantation was performed using a conventional length lateral wall electrode. Intraoperative device testing found normal impedance levels throughout the array; however, electrically evoked auditory potentials were absent on all electrodes. Upon initial activation 3 weeks after surgery, the patient reported excellent access to sound in the cochlear implant-only condition. He has made good progress at each subsequent visit; speech perception testing after seven months showed improvement from 0% to 32% on AzBio sentence and 53% on CNC phoneme testing in the cochlear implant-only condition. Conclusion We report the third case of cochlear implantation in a patient with CMT. SNHL in CMT is hypothesized to result from disruption of synchronous activity of the cochlear nerve. In patients with CMT, cochlear implantation may reconstitute synchronous neural activity by way of supraphysiological electrical stimulation. Our results corroborate two earlier reports that cochlear implantation is a viable option for rehabilitation of SNHL in this unique subset of patients.
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Sarankumar T, Arumugam SV, Goyal S, Chauhan N, Kumari A, Kameswaran M. Outcomes of Cochlear Implantation in Auditory Neuropathy Spectrum Disorder and the Role of Cortical Auditory Evoked Potentials in Benefit Evaluation. Turk Arch Otorhinolaryngol 2018; 56:15-20. [PMID: 29988272 DOI: 10.5152/tao.2017.2537] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 08/02/2017] [Indexed: 11/22/2022] Open
Abstract
Objective To compare the outcomes of cochlear implantation (CI) in children with auditory neuropathy spectrum disorder (ANSD) and age-matched controls with profound sensorineural hearing loss, using categories of auditory performance (CAP), speech intelligibility rate (SIR), meaningful auditory integration scale (MAIS), and meaningful use of speech scale (MUSS), and to determine the role of Cortical Auditory Evoked Potentials (CAEP) in benefit evaluation after CI. Methods Ten patients (8 males and two females) with ANSD who underwent CI were included in the study. Auditory and speech scores were compared between baseline and after 12 months of habilitation in children with ANSD. Post CI speech scores in children with ANSD were compared with the control group (age-matched children with profound sensorineural hearing loss) at 12 months of habilitation. P1 latency of CAEP has a good correlation with auditory and speech scores in children with ANSD in the study group. Results Significant benefits were seen in children with ANSD who underwent CI compared to the baseline CAP and SIR scores and one year after habilitation. There is no statistically significant difference in outcomes between the two groups with CI (ANSD and profound sensorineural hearing loss) (p-value: CAP=1.00, SIR=0.84, MAIS=0.33, MUSS=0.08). Speech perception in noise test (SPIN) scores in children with ANSD were 63% and 80% with 0 dB signal noise ratio (SNR) and +10dB SNR, respectively. P1 wave of CAEP has a good correlation with the subjective outcomes. Conclusion CI in children with ANSD has showed benefits comparable to children with profound sensorineural hearing loss. CAEP is a useful tool in objectively assessing cortical maturity in children with ANSD following CI.
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Affiliation(s)
| | | | - Sunil Goyal
- Department of Otorhinolaryngology, Madras ENT Research Foundation, Chennai, India
| | - Neha Chauhan
- Department of Otorhinolaryngology, Madras ENT Research Foundation, Chennai, India
| | - Abha Kumari
- Department of Otorhinolaryngology, Madras ENT Research Foundation, Chennai, India
| | - Mohan Kameswaran
- Department of Otorhinolaryngology, Madras ENT Research Foundation, Chennai, India
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Farinetti A, Raji A, Wu H, Wanna B, Vincent C. International consensus (ICON) on audiological assessment of hearing loss in children. Eur Ann Otorhinolaryngol Head Neck Dis 2018; 135:S41-S48. [PMID: 29366866 DOI: 10.1016/j.anorl.2017.12.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 12/13/2017] [Accepted: 12/14/2017] [Indexed: 11/24/2022]
Abstract
The prevalence of hearing loss in newborns and infants is estimated between 1 to 3.47 cases per 1000 live births. Early diagnosis and rehabilitation of congenital hearing loss are mandatory in order to achieve a satisfactory linguistic and cognitive development. Without appropriate opportunities to learn language, these children will fall behind their normal hearing peers in communication, cognition, reading and socio-emotional development. After promising results, neonatal screening for hearing loss and audiological evaluation are becoming more extensively carried out. In planning universal neonatal hearing screening programs, transient evoked otoacoustic emissions and auditory brainstem responses are the gold standard for the screening and diagnosis program. However, there is no consensus regarding the use of audiometry and other electrophysiological tests (such as auditory steady-state responses) in current practices. Several screening and audiological assessment procedures have been described and advocated all around the world. But, a systematic scheme of performing diagnosis in the pediatric audiology population is lacking. A consensus conference was held at the International Federation of Oto-rhino-laryngological Societies Congress, in June 2017, to discuss the different current practices and to identify the best neonatal hearing screening and audiological assessment management. This article is intended to provide professionals with recommendations about the "best practice" based on consensus opinion of the session's speakers, and a review of the literature on the efficacy of various assessment options for children with hearing loss.
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Affiliation(s)
- A Farinetti
- Department of Pediatric Otolaryngology, Hôpital La Timone Enfants, AP-HM, 264, avenue Saint-Pierre, 13005 Marseille, France.
| | - A Raji
- Department of Otolaryngology, Mohammed VI Hospital, avenue Ibn Sina Amerchich, BP2360 Marrakech-principal, Morocco
| | - H Wu
- Department of Otolaryngology Head and Neck Surgery, Shanghai Ninth People's Hospital & Shanghai Jiaotong University School of Medicine, 639, Zhizaoju Road, 200011 Shanghai, China
| | - B Wanna
- Department of Otolaryngology Head and Neck, Middle East Institute of Health-University Hospital, Bsalim main road, Mezher street, 60387 Bsalim-Metn, Lebanon
| | - C Vincent
- Department of Otolaryngology, Hôpital Roger-Salengro, Centre Hospitalier Régional de Lille, rue du Professeur-Emile-Laine, 59000 Lille, France
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Temporal Response Properties of the Auditory Nerve in Implanted Children with Auditory Neuropathy Spectrum Disorder and Implanted Children with Sensorineural Hearing Loss. Ear Hear 2018; 37:397-411. [PMID: 26655913 DOI: 10.1097/aud.0000000000000254] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE This study aimed to (1) characterize temporal response properties of the auditory nerve in implanted children with auditory neuropathy spectrum disorder (ANSD), and (2) compare results recorded in implanted children with ANSD with those measured in implanted children with sensorineural hearing loss (SNHL). DESIGN Participants included 28 children with ANSD and 29 children with SNHL. All subjects used cochlear nucleus devices in their test ears. Both ears were tested in 6 children with ANSD and 3 children with SNHL. For all other subjects, only one ear was tested. The electrically evoked compound action potential (ECAP) was measured in response to each of the 33 pulses in a pulse train (excluding the second pulse) for one apical, one middle-array, and one basal electrode. The pulse train was presented in a monopolar-coupled stimulation mode at 4 pulse rates: 500, 900, 1800, and 2400 pulses per second. Response metrics included the averaged amplitude, latencies of response components and response width, the alternating depth and the amount of neural adaptation. These dependent variables were quantified based on the last six ECAPs or the six ECAPs occurring within a time window centered around 11 to 12 msec. A generalized linear mixed model was used to compare these dependent variables between the 2 subject groups. The slope of the linear fit of the normalized ECAP amplitudes (re. amplitude of the first ECAP response) over the duration of the pulse train was used to quantify the amount of ECAP increment over time for a subgroup of 9 subjects. RESULTS Pulse train-evoked ECAPs were measured in all but 8 subjects (5 with ANSD and 3 with SNHL). ECAPs measured in children with ANSD had smaller amplitude, longer averaged P2 latency and greater response width than children with SNHL. However, differences in these two groups were only observed for some electrodes. No differences in averaged N1 latency or in the alternating depth were observed between children with ANSD and children with SNHL. Neural adaptation measured in these 2 subject groups was comparable for relatively short durations of stimulation (i.e., 11 to 12 msec). Children with ANSD showed greater neural adaptation than children with SNHL for a longer duration of stimulation. Amplitudes of ECAP responses rapidly declined within the first few milliseconds of stimulation, followed by a gradual decline up to 64 msec after stimulus onset in the majority of subjects. This decline exhibited an alternating pattern at some pulse rates. Further increases in pulse rate diminished this alternating pattern. In contrast, ECAPs recorded from at least one stimulating electrode in six ears with ANSD and three ears with SNHL showed a clear increase in amplitude over the time course of stimulation. The slope of linear regression functions measured in these subjects was significantly greater than zero. CONCLUSIONS Some but not all aspects of temporal response properties of the auditory nerve measured in this study differ between implanted children with ANSD and implanted children with SNHL. These differences are observed for some but not all electrodes. A new neural response pattern is identified. Further studies investigating its underlying mechanism and clinical relevance are warranted.
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Oertel D, Cao XJ, Ison JR, Allen PD. Cellular Computations Underlying Detection of Gaps in Sounds and Lateralizing Sound Sources. Trends Neurosci 2017; 40:613-624. [PMID: 28867348 DOI: 10.1016/j.tins.2017.08.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 08/02/2017] [Accepted: 08/07/2017] [Indexed: 11/29/2022]
Abstract
In mammals, acoustic information arises in the cochlea and is transmitted to the ventral cochlear nuclei (VCN). Three groups of VCN neurons extract different features from the firing of auditory nerve fibers and convey that information along separate pathways through the brainstem. Two of these pathways process temporal information: octopus cells detect coincident firing among auditory nerve fibers and transmit signals along monaural pathways, and bushy cells sharpen the encoding of fine structure and feed binaural pathways. The ability of these cells to signal with temporal precision depends on a low-voltage-activated K+ conductance (gKL) and a hyperpolarization-activated conductance (gh). This 'tale of two conductances' traces gap detection and sound lateralization to their cellular and biophysical origins.
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Affiliation(s)
- Donata Oertel
- Department of Neuroscience, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705 USA.
| | - Xiao-Jie Cao
- Department of Neuroscience, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705 USA
| | - James R Ison
- Department of Brain and Cognitive Sciences, Meliora Hall, University of Rochester, Rochester, NY 14627, USA; Department of Neuroscience, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Paul D Allen
- Department of Otolaryngology, University of Rochester Medical Center, Rochester, NY 14642, USA
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Fontenot TE, Giardina CK, Teagle HF, Park LR, Adunka OF, Buchman CA, Brown KD, Fitzpatrick DC. Clinical role of electrocochleography in children with auditory neuropathy spectrum disorder. Int J Pediatr Otorhinolaryngol 2017; 99:120-127. [PMID: 28688553 PMCID: PMC5538887 DOI: 10.1016/j.ijporl.2017.05.026] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 05/26/2017] [Accepted: 05/31/2017] [Indexed: 01/21/2023]
Abstract
OBJECTIVES To assess electrocochleography (ECochG) to tones as an instrument to account for CI speech perception outcomes in children with auditory neuropathy spectrum disorder (ANSD). MATERIALS & METHODS Children (<18 years) receiving CIs for ANSD (n = 30) and non-ANSD (n = 74) etiologies of hearing loss were evaluated with ECochG using tone bursts (0.25-4 kHz). The total response (TR) is the sum of spectral peaks of responses across frequencies. The compound action potential (CAP) and the auditory nerve neurophonic (ANN) in ECochG waveforms were used to estimate nerve activity and calculate nerve score. Performance on open-set monosyllabic word tests was the outcome measure. Standard statistical methods were applied. RESULTS On average, TR was larger in ANSD than in non-ANSD subjects. Most ANSD (73.3%) and non-ANSD (87.8%) subjects achieved open-set speech perception; TR accounted for 33% and 20% of variability in the outcomes, respectively. In the ANSD group, the PTA accounted for 69.3% of the variability, but there was no relationship with outcomes in the non-ANSD group. In both populations, nerve score was sensitive in identifying subjects at risk for not acquiring open-set speech perception, while the CAP and the ANN were more specific. CONCLUSION In both subject groups, the TRs correlated with outcomes but these measures were notably larger in the ANSD group. There was also strong correlation between PTA and speech perception outcome in ANSD group. In both subject populations, weaker evidence of neural activity was related to failure to achieve open-set speech perception.
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Affiliation(s)
- Tatyana E Fontenot
- University of North Carolina at Chapel Hill, Department of Otolaryngology, Chapel Hill, NC, United States.
| | - Christopher K Giardina
- University of North Carolina at Chapel Hill, Department of Otolaryngology, Chapel Hill, NC, United States; University of North Carolina School of Medicine, Chapel Hill, NC, United States
| | - Holly F Teagle
- University of North Carolina at Chapel Hill, Department of Otolaryngology, Chapel Hill, NC, United States
| | - Lisa R Park
- University of North Carolina at Chapel Hill, Department of Otolaryngology, Chapel Hill, NC, United States
| | - Oliver F Adunka
- The Ohio State University, Department of Otolaryngology, Columbus, OH, United States
| | - Craig A Buchman
- Washington University in St. Louis, Department of Otolaryngology, St. Louis, MO, United States
| | - Kevin D Brown
- University of North Carolina at Chapel Hill, Department of Otolaryngology, Chapel Hill, NC, United States
| | - Douglas C Fitzpatrick
- University of North Carolina at Chapel Hill, Department of Otolaryngology, Chapel Hill, NC, United States; University of North Carolina School of Medicine, Chapel Hill, NC, United States
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Riggs WJ, Roche JP, Giardina CK, Harris MS, Bastian ZJ, Fontenot TE, Buchman CA, Brown KD, Adunka OF, Fitzpatrick DC. Intraoperative Electrocochleographic Characteristics of Auditory Neuropathy Spectrum Disorder in Cochlear Implant Subjects. Front Neurosci 2017; 11:416. [PMID: 28769753 PMCID: PMC5515907 DOI: 10.3389/fnins.2017.00416] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 07/04/2017] [Indexed: 11/13/2022] Open
Abstract
Auditory neuropathy spectrum disorder (ANSD) is characterized by an apparent discrepancy between measures of cochlear and neural function based on auditory brainstem response (ABR) testing. Clinical indicators of ANSD are a present cochlear microphonic (CM) with small or absent wave V. Many identified ANSD patients have speech impairment severe enough that cochlear implantation (CI) is indicated. To better understand the cochleae identified with ANSD that lead to a CI, we performed intraoperative round window electrocochleography (ECochG) to tone bursts in children (n = 167) and adults (n = 163). Magnitudes of the responses to tones of different frequencies were summed to measure the "total response" (ECochG-TR), a metric often dominated by hair cell activity, and auditory nerve activity was estimated visually from the compound action potential (CAP) and auditory nerve neurophonic (ANN) as a ranked "Nerve Score". Subjects identified as ANSD (45 ears in children, 3 in adults) had higher values of ECochG-TR than adult and pediatric subjects also receiving CIs not identified as ANSD. However, nerve scores of the ANSD group were similar to the other cohorts, although dominated by the ANN to low frequencies more than in the non-ANSD groups. To high frequencies, the common morphology of ANSD cases was a large CM and summating potential, and small or absent CAP. Common morphologies in other groups were either only a CM, or a combination of CM and CAP. These results indicate that responses to high frequencies, derived primarily from hair cells, are the main source of the CM used to evaluate ANSD in the clinical setting. However, the clinical tests do not capture the wide range of neural activity seen to low frequency sounds.
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Affiliation(s)
- William J Riggs
- Department of Otolaryngology/Head and Neck Surgery, Ohio State University College of MedicineColumbus, OH, United States
| | - Joseph P Roche
- Lab Department of Otolaryngology/Head and Neck Surgery, University of Wisconsin School of MedicineMadison, WI, United States
| | - Christopher K Giardina
- Department of Otolaryngology/Head and Neck Surgery, The University of North Carolina at Chapel Hill School of MedicineChapel Hill, NC, United States
| | - Michael S Harris
- Department of Otolaryngology/Head and Neck Surgery, Ohio State University College of MedicineColumbus, OH, United States
| | - Zachary J Bastian
- Department of Otolaryngology/Head and Neck Surgery, The University of North Carolina at Chapel Hill School of MedicineChapel Hill, NC, United States
| | - Tatyana E Fontenot
- Department of Otolaryngology/Head and Neck Surgery, The University of North Carolina at Chapel Hill School of MedicineChapel Hill, NC, United States
| | - Craig A Buchman
- Department of Otolaryngology/Head and Neck Surgery, Washington University School of Medicine in St. LouisSt. Louis, MO, United States
| | - Kevin D Brown
- Department of Otolaryngology/Head and Neck Surgery, The University of North Carolina at Chapel Hill School of MedicineChapel Hill, NC, United States
| | - Oliver F Adunka
- Department of Otolaryngology/Head and Neck Surgery, Ohio State University College of MedicineColumbus, OH, United States
| | - Douglas C Fitzpatrick
- Department of Otolaryngology/Head and Neck Surgery, The University of North Carolina at Chapel Hill School of MedicineChapel Hill, NC, United States
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Prabhu P, Barman A. Effectiveness of low-cut modified amplification strategy and channel-free hearing aid in individuals with auditory neuropathy spectrum disorder. Int J Audiol 2017; 56:759-766. [DOI: 10.1080/14992027.2017.1323123] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Prashanth Prabhu
- Department of Audiology, All India Institute of Speech and Hearing, Mysore, India
| | - Animesh Barman
- Department of Audiology, All India Institute of Speech and Hearing, Mysore, India
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Yuvaraj P, Jayaram M. Audiological Profile of Adult Persons with Auditory Neuropathy Spectrum Disorders. J Audiol Otol 2016; 20:158-167. [PMID: 27942602 PMCID: PMC5144811 DOI: 10.7874/jao.2016.20.3.158] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 07/20/2016] [Accepted: 08/03/2016] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND AND OBJECTIVES The auditory profile of a large number of persons with late onset auditory neuropathy spectrum disorder (ANSD) is recently described in the Indian context. The purpose of study was 1) to profile data on routine audiological parameters, cortical evoked potentials, and temporal processing, 2) to analyze the benefit from hearing aids for persons with ANSD, and 3) to understand the association between benefit from hearing aids and auditory profile. SUBJECTS AND METHODS Thirty-eight adults with late onset ANSD and a matched group of 40 normally hearing adults participated in the study. Basic audiological tests, recording of cortical evoked potentials, and temporal processing tests were carried out on both groups of participant while only persons with ANSD were fitted with hearing aid. RESULTS Subjects in the two groups were significantly different on all the audiological parameters. ANSD group seemed to benefit from hearing aids variably. The mean amplitude of N2 was significantly different between normally-hearing participants and patients with ANSD. CONCLUSIONS Residual temporal processing, particularly amplitude modulation detection seems to be associated with benefit from hearing aids in patients with ANSD.
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Affiliation(s)
- Pradeep Yuvaraj
- Department of Speech-Language Pathology & Audiology, National Institute of Mental Health & Neurosciences, Bangalore, India
| | - Mannarukrishnaiah Jayaram
- Department of Speech-Language Pathology & Audiology, National Institute of Mental Health & Neurosciences, Bangalore, India
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