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Huang CY, Chen YA, Wu RM, Hwang IS. Neural Oscillations and Functional Significances for Prioritizing Dual-Task Walking in Parkinson's Disease. J Parkinsons Dis 2024; 14:283-296. [PMID: 38457151 DOI: 10.3233/jpd-230245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/09/2024]
Abstract
Background Task prioritization involves allocating brain resources in a dual-task scenario, but the mechanistic details of how prioritization strategies affect dual-task walking performance for Parkinson's disease (PD) are little understood. Objective We investigated the performance benefits and corresponding neural signatures for people with PD during dual-task walking, using gait-prioritization (GP) and manual-prioritization (MP) strategies. Methods Participants (N = 34) were asked to hold two inter-locking rings while walking and to prioritize either taking big steps (GP strategy) or separating the two rings (MP strategy). Gait parameters and ring-touch time were measured, and scalp electroencephalograph was performed. Results Compared with the MP strategy, the GP strategy yielded faster walking speed and longer step length, whereas ring-touch time did not significantly differ between the two strategies. The MP strategy led to higher alpha (8-12 Hz) power in the posterior cortex and beta (13-35 Hz) power in the left frontal-temporal area, but the GP strategy was associated with stronger network connectivity in the beta band. Changes in walking speed and step length because of prioritization negatively correlated with changes in alpha power. Prioritization-related changes in ring-touch time correlated negatively with changes in beta power but positively with changes in beta network connectivity. Conclusions A GP strategy in dual-task walking for PD can enhance walking speed and step length without compromising performance in a secondary manual task. This strategy augments attentional focus and facilitates compensatory reinforcement of inter-regional information exchange.
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Affiliation(s)
- Cheng-Ya Huang
- School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan
- Physical Therapy Center, National Taiwan University Hospital, Taipei, Taiwan
| | - Yu-An Chen
- Department of Rehabilitation, Division of Physical Therapy, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan
| | - Ruey-Meei Wu
- Department of Neurology, National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Ing-Shiou Hwang
- Department of Physical Therapy, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
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2
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Muñoz D, Barria P, Cifuentes CA, Aguilar R, Baleta K, Azorín JM, Múnera M. EEG Evaluation in a Neuropsychological Intervention Program Based on Virtual Reality in Adults with Parkinson's Disease. Biosensors (Basel) 2022; 12:bios12090751. [PMID: 36140136 PMCID: PMC9496185 DOI: 10.3390/bios12090751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 08/09/2022] [Accepted: 08/18/2022] [Indexed: 05/05/2023]
Abstract
Nowadays, several strategies for treating neuropsychologic function loss in Parkinson’s disease (PD) have been proposed, such as physical activity performance and developing games to exercise the mind. However, few studies illustrate the incidence of these therapies in neuronal activity. This work aims to study the feasibility of a virtual reality-based program oriented to the cognitive functions’ rehabilitation of PD patients. For this, the study was divided into intervention with the program, acquisition of signals, data processing, and results analysis. The alpha and beta bands’ power behavior was determined by evaluating the electroencephalography (EEG) signals obtained during the execution of control tests and games of the “Hand Physics Lab” Software, from which five games related to attention, planning, and sequencing, concentration, and coordination were taken. Results showed the characteristic performance of the cerebral bands during resting states and activity states. In addition, it was determined that the beta band increased its activity in all the cerebral lobes in all the tested games (p-value < 0.05). On the contrary, just one game exhibited an adequate performance of the alpha band activity of the temporal and frontal lobes (p-value < 0.02). Furthermore, the visual attention and the capacity to process and interpret the information given by the surroundings was favored during the execution of trials (p-value < 0.05); thus, the efficacy of the virtual reality program to recover cognitive functions was verified. The study highlights implementing new technologies to rehabilitate people with neurodegenerative diseases.
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Affiliation(s)
- Daniela Muñoz
- Biomedical Engineering Department, Colombian School of Engineering Julio Garavito, Bogota 111166, Colombia
| | - Patricio Barria
- Club de Leones Cruz del Sur Rehabilitation Center, Punta Arenas 6210133, Chile
- Electrical Engineering Deparment, University of Magallanes, Punta Arenas 6210427, Chile
- Systems Engineering and Automation Department, Brain-Machine Interface Systems Lab, Miguel Hernández University of Elche UMH, 03202 Elche, Spain
| | - Carlos A. Cifuentes
- Bristol Robotics Laboratory, University of the West of England, Bristol BS16 1QY, UK
- School of Engineering, Science and Technology, Universidad del Rosario, Bogotá 111711, Colombia
- Correspondence:
| | - Rolando Aguilar
- Electrical Engineering Deparment, University of Magallanes, Punta Arenas 6210427, Chile
| | - Karim Baleta
- Club de Leones Cruz del Sur Rehabilitation Center, Punta Arenas 6210133, Chile
| | - José M. Azorín
- Systems Engineering and Automation Department, Brain-Machine Interface Systems Lab, Miguel Hernández University of Elche UMH, 03202 Elche, Spain
| | - Marcela Múnera
- Biomedical Engineering Department, Colombian School of Engineering Julio Garavito, Bogota 111166, Colombia
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3
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Alatalo D, Jiang L, Geddes D, Hassanipour F. Nipple Deformation and Peripheral Pressure on the Areola During Breastfeeding. J Biomech Eng 2019; 142:2733243. [DOI: 10.1115/1.4043665] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Indexed: 11/08/2022]
Abstract
Abstract
Breastfeeding is a complex process where the infant utilizes two forms of pressure during suckling, vacuum and compression. Infant applied compression, or positive oral pressure, to the breast has not been previously studied in vivo. The goal of this study is to use a methodology to capture the positive oral pressure values exerted by infants' maxilla (upper jaw) and mandible (lower jaw) on the breast areola during breastfeeding. In this study, the positive and negative (vacuum) pressure values are obtained simultaneously on six lactating mothers. Parallel to the pressure data measurements, ultrasound images are captured and processed to reveal the nipple deformations and the displacements of infants' tongues and jaw movements during breastfeeding. Motivated by the significant differences in composition between the tissue of the breast and the nipple–areola complex, the strain ratio values of the lactating nipples are obtained using these deformation measurements along with pre- and postfeed three-dimensional (3D) scans of the breast. The findings show an oscillatory positive pressure profile on the breast under both maxilla and mandible, which differs from clinical indications that only the mandible of an infant moves during breastfeeding. The strain ratio varies between mothers, which indicates volume changes in the nipple during feeding and suggests that previous assumptions regarding strain ratio for nonlactating breasts will not accurately apply to breast tissue during lactation.
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Affiliation(s)
- Diana Alatalo
- Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080
| | - Lin Jiang
- Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080
| | - Donna Geddes
- School of Chemistry and Biochemistry, University of Western Australia, Crawley, WA 6009, Australia
| | - Fatemeh Hassanipour
- Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080
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4
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Shepherd D, Lodhia V, Hautus MJ. Electrophysiological indices of amplitude modulated sounds and sensitivity to noise. Int J Psychophysiol 2019; 139:59-67. [DOI: 10.1016/j.ijpsycho.2019.03.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 02/18/2019] [Accepted: 03/13/2019] [Indexed: 10/27/2022]
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Lee S, Zhao X, Davis KA, Topjian AA, Litt B, Abend NS. Quantitative EEG predicts outcomes in children after cardiac arrest. Neurology 2019; 92:e2329-e2338. [PMID: 30971485 DOI: 10.1212/wnl.0000000000007504] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 01/17/2019] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVE To determine whether quantitative EEG (QEEG) features predict neurologic outcomes in children after cardiac arrest. METHODS We performed a single-center prospective observational study of 87 consecutive children resuscitated and admitted to the pediatric intensive care unit after cardiac arrest. Full-array conventional EEG data were obtained as part of clinical management. We computed 8 QEEG features from 5-minute epochs every hour after return of circulation. We developed predictive models utilizing random forest classifiers trained on patient age and 8 QEEG features to predict outcome. The features included SD of each EEG channel, normalized band power in alpha, beta, theta, delta, and gamma wave frequencies, line length, and regularity function scores. We measured outcomes using Pediatric Cerebral Performance Category (PCPC) scores. We evaluated the models using 5-fold cross-validation and 1,000 bootstrap samples. RESULTS The best performing model had a 5-fold cross-validation accuracy of 0.8 (0.88 area under the receiver operating characteristic curve). It had a positive predictive value of 0.79 and a sensitivity of 0.84 in predicting patients with favorable outcomes (PCPC score of 1-3). It had a negative predictive value of 0.8 and a specificity of 0.75 in predicting patients with unfavorable outcomes (PCPC score of 4-6). The model also identified the relative importance of each feature. Analyses using only frontal electrodes did not differ in prediction performance compared to analyses using all electrodes. CONCLUSIONS QEEG features can standardize EEG interpretation and predict neurologic outcomes in children after cardiac arrest.
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Affiliation(s)
- Seungha Lee
- From the Department of Bioengineering (S.L., X.Z., B.L.), The University of Pennsylvania; Department of Neurology (K.A.D., B.L., N.S.A.), Perelman School of Medicine at the University of Pennsylvania; and the Departments of Pediatrics (N.S.A.) and Anesthesia and Critical Care Medicine (A.A.T., N.S.A.), Children's Hospital of Philadelphia and Perelman School of Medicine at the University of Pennsylvania, Philadelphia
| | - Xuelong Zhao
- From the Department of Bioengineering (S.L., X.Z., B.L.), The University of Pennsylvania; Department of Neurology (K.A.D., B.L., N.S.A.), Perelman School of Medicine at the University of Pennsylvania; and the Departments of Pediatrics (N.S.A.) and Anesthesia and Critical Care Medicine (A.A.T., N.S.A.), Children's Hospital of Philadelphia and Perelman School of Medicine at the University of Pennsylvania, Philadelphia
| | - Kathryn A Davis
- From the Department of Bioengineering (S.L., X.Z., B.L.), The University of Pennsylvania; Department of Neurology (K.A.D., B.L., N.S.A.), Perelman School of Medicine at the University of Pennsylvania; and the Departments of Pediatrics (N.S.A.) and Anesthesia and Critical Care Medicine (A.A.T., N.S.A.), Children's Hospital of Philadelphia and Perelman School of Medicine at the University of Pennsylvania, Philadelphia
| | - Alexis A Topjian
- From the Department of Bioengineering (S.L., X.Z., B.L.), The University of Pennsylvania; Department of Neurology (K.A.D., B.L., N.S.A.), Perelman School of Medicine at the University of Pennsylvania; and the Departments of Pediatrics (N.S.A.) and Anesthesia and Critical Care Medicine (A.A.T., N.S.A.), Children's Hospital of Philadelphia and Perelman School of Medicine at the University of Pennsylvania, Philadelphia
| | - Brian Litt
- From the Department of Bioengineering (S.L., X.Z., B.L.), The University of Pennsylvania; Department of Neurology (K.A.D., B.L., N.S.A.), Perelman School of Medicine at the University of Pennsylvania; and the Departments of Pediatrics (N.S.A.) and Anesthesia and Critical Care Medicine (A.A.T., N.S.A.), Children's Hospital of Philadelphia and Perelman School of Medicine at the University of Pennsylvania, Philadelphia
| | - Nicholas S Abend
- From the Department of Bioengineering (S.L., X.Z., B.L.), The University of Pennsylvania; Department of Neurology (K.A.D., B.L., N.S.A.), Perelman School of Medicine at the University of Pennsylvania; and the Departments of Pediatrics (N.S.A.) and Anesthesia and Critical Care Medicine (A.A.T., N.S.A.), Children's Hospital of Philadelphia and Perelman School of Medicine at the University of Pennsylvania, Philadelphia.
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Spriggs MJ, Thompson CS, Moreau D, McNair NA, Wu CC, Lamb YN, McKay NS, King ROC, Antia U, Shelling AN, Hamm JP, Teyler TJ, Russell BR, Waldie KE, Kirk IJ. Human Sensory LTP Predicts Memory Performance and Is Modulated by the BDNF Val 66Met Polymorphism. Front Hum Neurosci 2019; 13:22. [PMID: 30828292 PMCID: PMC6384276 DOI: 10.3389/fnhum.2019.00022] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Accepted: 01/18/2019] [Indexed: 12/16/2022] Open
Abstract
Background: Long-term potentiation (LTP) is recognised as a core neuronal process underlying long-term memory. However, a direct relationship between LTP and human memory performance is yet to be demonstrated. The first aim of the current study was thus to assess the relationship between LTP and human long-term memory performance. With this also comes an opportunity to explore factors thought to mediate the relationship between LTP and long-term memory. The second aim of the current study was to explore the relationship between LTP and memory in groups differing with respect to brain-derived neurotrophic factor (BDNF) Val66Met; a single-nucleotide polymorphism (SNP) implicated in memory function. Methods: Participants were split into three genotype groups (Val/Val, Val/Met, Met/Met) and were presented with both an EEG paradigm for inducing LTP-like enhancements of the visually-evoked response, and a test of visual memory. Results: The magnitude of LTP 40 min after induction was predictive of long-term memory performance. Additionally, the BDNF Met allele was associated with both reduced LTP and reduced memory performance. Conclusions: The current study not only presents the first evidence for a relationship between sensory LTP and human memory performance, but also demonstrates how targeting this relationship can provide insight into factors implicated in variation in human memory performance. It is anticipated that this will be of utility to future clinical studies of disrupted memory function.
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Affiliation(s)
- Meg J Spriggs
- Faculty of Science, School of Psychology, University of Auckland, Auckland, New Zealand.,Centre for Brain Research, University of Auckland, Auckland, New Zealand.,Brain Research New Zealand, Auckland, New Zealand.,Psychedelic Research Group, Division of Brain Sciences, Centre for Psychiatry, Imperial College London, London, United Kingdom
| | - Chris S Thompson
- Faculty of Science, School of Psychology, University of Auckland, Auckland, New Zealand.,Centre for Brain Research, University of Auckland, Auckland, New Zealand
| | - David Moreau
- Faculty of Science, School of Psychology, University of Auckland, Auckland, New Zealand.,Centre for Brain Research, University of Auckland, Auckland, New Zealand
| | - Nicolas A McNair
- Faculty of Science, School of Psychology, University of Auckland, Auckland, New Zealand.,School of Psychology, University of Sydney, Sydney, NSW, Australia
| | - C Carolyn Wu
- Faculty of Science, School of Psychology, University of Auckland, Auckland, New Zealand.,Department of Psychology, University of Trier, Trier, Germany
| | - Yvette N Lamb
- Faculty of Science, School of Psychology, University of Auckland, Auckland, New Zealand.,Centre for Brain Research, University of Auckland, Auckland, New Zealand
| | - Nicole S McKay
- Faculty of Science, School of Psychology, University of Auckland, Auckland, New Zealand.,Centre for Brain Research, University of Auckland, Auckland, New Zealand
| | - Rohan O C King
- Faculty of Science, School of Psychology, University of Auckland, Auckland, New Zealand.,Centre for Brain Research, University of Auckland, Auckland, New Zealand
| | - Ushtana Antia
- Faculty of Medical and Health Sciences, School of Pharmacy, University of Auckland, Auckland, New Zealand.,Boston Scientific, Mascot, NSW, Australia
| | - Andrew N Shelling
- Centre for Brain Research, University of Auckland, Auckland, New Zealand.,Department of Obstetrics & Gynaecology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Jeff P Hamm
- Faculty of Science, School of Psychology, University of Auckland, Auckland, New Zealand.,Centre for Brain Research, University of Auckland, Auckland, New Zealand
| | | | - Bruce R Russell
- Faculty of Medical and Health Sciences, School of Pharmacy, University of Auckland, Auckland, New Zealand.,School of Pharmacy, University of Otago, Dunedin, New Zealand
| | - Karen E Waldie
- Faculty of Science, School of Psychology, University of Auckland, Auckland, New Zealand.,Centre for Brain Research, University of Auckland, Auckland, New Zealand
| | - Ian J Kirk
- Faculty of Science, School of Psychology, University of Auckland, Auckland, New Zealand.,Centre for Brain Research, University of Auckland, Auckland, New Zealand.,Brain Research New Zealand, Auckland, New Zealand
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7
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Lodhia V, Hautus MJ, Johnson BW, Brock J. Atypical brain responses to auditory spatial cues in adults with autism spectrum disorder. Eur J Neurosci 2017; 47:682-689. [DOI: 10.1111/ejn.13694] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 08/19/2017] [Accepted: 08/23/2017] [Indexed: 12/01/2022]
Affiliation(s)
- Veema Lodhia
- Research Centre for Cognitive Neuroscience School of Psychology The University of Auckland Private Bag 92019 Auckland 1142 New Zealand
| | - Michael J. Hautus
- Research Centre for Cognitive Neuroscience School of Psychology The University of Auckland Private Bag 92019 Auckland 1142 New Zealand
| | - Blake W. Johnson
- ARC Centre of Excellence in Cognition and its Disorders Sydney Australia
- Department of Cognitive Science Macquarie University Sydney NSW Australia
| | - Jon Brock
- ARC Centre of Excellence in Cognition and its Disorders Sydney Australia
- Department of Cognitive Science Macquarie University Sydney NSW Australia
- Department of Psychology Macquarie University Sydney NSW Australia
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8
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Spriggs M, Cadwallader C, Hamm J, Tippett L, Kirk I. Age-related alterations in human neocortical plasticity. Brain Res Bull 2017; 130:53-59. [DOI: 10.1016/j.brainresbull.2016.12.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Accepted: 12/23/2016] [Indexed: 12/17/2022]
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9
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Lee H, Wang GY, Curley LE, Kydd RR, Kirk IJ, Russell BR. Investigation of the effects of 'piperazine-containing party pills' and dexamphetamine on interhemispheric communication using electroencephalography. Psychopharmacology (Berl) 2016; 233:2869-77. [PMID: 27289365 DOI: 10.1007/s00213-016-4335-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Accepted: 05/09/2016] [Indexed: 12/24/2022]
Abstract
BACKGROUND 'Piperazine-containing party pills' were marketed and sold as legal alternatives to methamphetamine and 3,4-methylenedioxymethamphetamine (MDMA) until 2008 in New Zealand. The major constituents of these 'pills' were benzylphenylpiperazine (BZP) and trifluoromethylphenylpiperazine (TFMPP). Despite their popularity, there is a paucity of knowledge about their central effects in humans. This study investigated their effects on human neural processing using electroencephalographic techniques. METHODS A randomised, double-blind, placebo-controlled study investigated the effects of an acute dose of these compounds on the interhemispheric transfer of information (IHTT) using the Poffenberger task. Reaction time data were also collected. Healthy, right-handed males were given an oral dose of either BZP (n = 13) (200 mg), TFMPP (n = 15) (60 mg), a combination of BZP + TFMPP (n = 15) (100 mg/30 mg), dexamphetamine (n = 16) (20 mg), or placebo (n = 23) and tested both before and 120 min after drug administration. RESULTS A mixed factorial repeated measures analysis of variance of absolute N160 latency and contrast analysis revealed that only TFMPP (F (1,77) = 17.30, p ≤ 0.001) significantly reduced the absolute N160 latency. Analysis of the IHTT revealed that only TFMPP (F (1,77) = 5.266, p ≤ 0.02) significantly reduced the IHTT, while BZP, BZP + TFMPP and dexamphetamine had no effect. Contrast analysis revealed that both TFMPP (F (1,77) = 17.30, p ≤ 0.001) and placebo (F (1,77) = 15.08, p ≤ 0.001) preserved the laterality of information transfer from one hemisphere to the other. Reaction time (p > 0.05) was not significantly affected by any of the drug treatments. CONCLUSIONS The usual directional asymmetry (i.e. faster R-to-L transfer relative to L-to-R) observed in healthy control group was absent following the administration of either BZP, BZP + TFMPP or dexamphetamine. Surprisingly, lateralised hemispheric function was not affected by TFMPP. Our findings highlight how the administration of BZP, TFMPP and BZP + TFMPP leads to changes in the pattern of information transfer.
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Affiliation(s)
- HeeSeung Lee
- School of Pharmacy, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Grace Y Wang
- Department of Psychology, Auckland University of Technology, Auckland, New Zealand
| | - Louise E Curley
- School of Pharmacy, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand.,Centre for Brain Research, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Rob R Kydd
- Department of Psychological Medicine, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Ian J Kirk
- Cognitive Neuroscience Research Group, School of Psychology, The University of Auckland, Auckland, New Zealand.,Centre for Brain Research, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Bruce R Russell
- National School of Pharmacy, Faculty of Medical and Health Sciences, University of Otago, PO Box 56, Dunedin, 9054, New Zealand. .,School of Pharmacy, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand. .,Centre for Brain Research, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand.
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10
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Lee H, Wang GY, Curley LE, Sollers JJ, Kydd RR, Kirk IJ, Russell BR. Acute effects of BZP, TFMPP and the combination of BZP and TFMPP in comparison to dexamphetamine on an auditory oddball task using electroencephalography: a single-dose study. Psychopharmacology (Berl) 2016; 233:863-71. [PMID: 26630992 DOI: 10.1007/s00213-015-4165-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 11/18/2015] [Indexed: 12/23/2022]
Abstract
RATIONALE Piperazine-based designer drugs such as benzylpiperazine (BZP) and trifluoromethylphenylpiperazine (TFMPP) have been marketed and sold as legal alternatives to dexamphetamine and 3,4-methylenedioxymethamphetamine (MDMA) until 2008 in New Zealand. When administered in combination, BZP + TFMPP have been reported to produce drug-drug synergism in rodents by stimulating the release of dopamine and serotonin. OBJECTIVES This study was to evaluate the acute event-related potential effects of BZP, TFMPP or the combination of BZP + TFMPP compared with dexamphetamine in young healthy male adults. METHODS A double-blind, randomised, placebo-controlled study investigated the effects of BZP, TFMPP, the combination of BZP + TFMPP, and dexamphetamine on the event-related potentials during an auditory oddball task. Healthy, right-handed males were given a single oral dose of either BZP (200 mg), TFMPP (60 mg), a combination of BZP + TFMPP (100/30 mg), dexamphetamine (20 mg) or placebo (lactose) and tested both before and 120 min after drug administration. RESULTS A single dose of either TMFPP (t = -2.29, p = 0.03) or dexamphetamine (t = -2.33, p = 0.02) significantly reduced the P300 amplitude. A similar trend was also found in BZP. In contrast, BZP and TFMPP in combination has no effect. Neither P300 latency nor the mean reaction time was affected by any of the drug treatments. In addition, neither the P100 nor the P200 component was significantly affected following any of the drug treatments. CONCLUSIONS A single oral dose of BZP or TFMPP, but not the combination of BZP/TFMPP, affected auditory sensory-evoked P300 potential in a manner similar to dexamphetamine.
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Affiliation(s)
- HeeSeung Lee
- School of Pharmacy, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
- Centre for Brain Research, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Grace Y Wang
- Department of Psychology, Auckland University of Technology, Auckland, New Zealand
| | - Louise E Curley
- School of Pharmacy, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
- Centre for Brain Research, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - John J Sollers
- Department of Psychological Medicine, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Rob R Kydd
- Department of Psychological Medicine, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
- Cognitive Neuroscience Research Group, School of Psychology, The University of Auckland, Auckland, New Zealand
| | - Ian J Kirk
- Cognitive Neuroscience Research Group, School of Psychology, The University of Auckland, Auckland, New Zealand
- Centre for Brain Research, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Bruce R Russell
- School of Pharmacy, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand.
- Centre for Brain Research, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand.
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11
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Smallwood N, Spriggs MJ, Thompson CS, Wu CC, Hamm JP, Moreau D, Kirk IJ. Influence of Physical Activity on Human Sensory Long-Term Potentiation. J Int Neuropsychol Soc 2015; 21:831-40. [PMID: 26581794 DOI: 10.1017/S1355617715001095] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A growing body of literature has explored the influence of physical activity on brain structure and function. While the mechanisms of this relationship remain largely speculative, recent research suggests that one of the effects of physical exercise is an increase in synaptic long-term potentiation (LTP). This has not yet been explored directly in humans due to the difficulty of measuring LTP non-invasively. However, we have previously established that LTP-like changes in visual-evoked potentials (VEPs) can be measured in humans. Here, we investigated whether physical fitness status affects the degree of visual sensory LTP. Using a self-report measure of physical activity, participants were split into two groups: a high-activity group, and a low-activity group. LTP was measured and compared between the two groups using the previously established electroencephalography-LTP paradigm, which assesses the degree to which the N1b component of the VEP elicited by a sine grating is potentiated (enhanced) following a rapid "tetanic" presentation of that grating. Both groups demonstrated increased negativity in the amplitude of the N1b component of the VEP immediately after presentation of the visual "tetanus," indicating potentiation. However, after a 30-min rest period, the N1b for the high-activity group remained potentiated while the N1b for the low-activity group returned to baseline. This study presents the first evidence for the impact of self-reported levels of physical activity on LTP in humans, and sheds light on potential neurological mechanisms underlying the relationship between physical fitness and cognition.
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12
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Lodhia V, Brock J, Johnson BW, Hautus MJ. Reduced object related negativity response indicates impaired auditory scene analysis in adults with autistic spectrum disorder. PeerJ 2014; 2:e261. [PMID: 24688845 PMCID: PMC3940479 DOI: 10.7717/peerj.261] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 01/15/2014] [Indexed: 11/20/2022] Open
Abstract
Auditory Scene Analysis provides a useful framework for understanding atypical auditory perception in autism. Specifically, a failure to segregate the incoming acoustic energy into distinct auditory objects might explain the aversive reaction autistic individuals have to certain auditory stimuli or environments. Previous research with non-autistic participants has demonstrated the presence of an Object Related Negativity (ORN) in the auditory event related potential that indexes pre-attentive processes associated with auditory scene analysis. Also evident is a later P400 component that is attention dependent and thought to be related to decision-making about auditory objects. We sought to determine whether there are differences between individuals with and without autism in the levels of processing indexed by these components. Electroencephalography (EEG) was used to measure brain responses from a group of 16 autistic adults, and 16 age- and verbal-IQ-matched typically-developing adults. Auditory responses were elicited using lateralized dichotic pitch stimuli in which inter-aural timing differences create the illusory perception of a pitch that is spatially separated from a carrier noise stimulus. As in previous studies, control participants produced an ORN in response to the pitch stimuli. However, this component was significantly reduced in the participants with autism. In contrast, processing differences were not observed between the groups at the attention-dependent level (P400). These findings suggest that autistic individuals have difficulty segregating auditory stimuli into distinct auditory objects, and that this difficulty arises at an early pre-attentive level of processing.
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Affiliation(s)
- Veema Lodhia
- Research Centre for Cognitive Neuroscience, School of Psychology, The University of Auckland , New Zealand
| | - Jon Brock
- ARC Centre of Excellence in Cognition and its Disorders , Australia ; Department of Cognitive Science, Macquarie University , Sydney , Australia
| | - Blake W Johnson
- ARC Centre of Excellence in Cognition and its Disorders , Australia ; Department of Cognitive Science, Macquarie University , Sydney , Australia
| | - Michael J Hautus
- Research Centre for Cognitive Neuroscience, School of Psychology, The University of Auckland , New Zealand
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Hausmann M, Hamm JP, Waldie KE, Kirk IJ. Sex hormonal modulation of interhemispheric transfer time. Neuropsychologia 2013; 51:1734-41. [PMID: 23727572 DOI: 10.1016/j.neuropsychologia.2013.05.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Revised: 05/21/2013] [Accepted: 05/23/2013] [Indexed: 11/21/2022]
Abstract
It is still a matter of debate whether functional cerebral asymmetries (FCA) of many cognitive processes are more pronounced in men than in women. Some evidence suggests that the apparent reduction in women's FCA is a result of the fluctuating levels of gonadal steroid hormones over the course of the menstrual cycle, making their FCA less static than for men. The degree of lateralization has been suggested to depend on interhemispheric communication that may be modulated by gonadal steroid hormones. Here, we employed visual-evoked EEG potentials to obtain a direct measure of interhemispheric communication during different phases of the menstrual cycle. The interhemispheric transfer time (IHTT) was estimated from the interhemispheric latency difference of the N170 component of the visual-evoked potential from either left or right visual field presentation. Nineteen right-handed women with regular menstrual cycles were tested twice, once during the menstrual phase, when progesterone and estradiol levels are low, and once during the luteal phase when progesterone and estradiol levels are high. Plasma steroid levels were determined by blood-based immunoassay at each session. It was found that IHTT, in particular from right-to-left, was generally longer during the luteal phase relative to the menstrual phase. This effect occurred as a consequence of a slowed absolute N170 latency of the indirect pathway (i.e. left hemispheric response after LVF stimulation) and, in particular, a shortened latency of the direct pathway (i.e. right hemispheric response after LVF stimulation) during the luteal phase. These results show that cycle-related effects are not restricted to modulation of processes between hemispheres but also apply to cortical interactions, especially within the right hemisphere. The findings support the view that plastic changes in the female brain occur during relatively short-term periods across the menstrual cycle.
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Milivojevic B, Hamm JP, Corballis MC. About turn: How object orientation affects categorisation and mental rotation. Neuropsychologia 2011; 49:3758-67. [DOI: 10.1016/j.neuropsychologia.2011.09.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Revised: 09/14/2011] [Accepted: 09/19/2011] [Indexed: 11/23/2022]
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Lee H, Kydd RR, Lim VK, Kirk IJ, Russell BR. Effects of trifluoromethylphenylpiperazine (TFMPP) on interhemispheric communication. Psychopharmacology (Berl) 2011; 213:707-14. [PMID: 20924753 DOI: 10.1007/s00213-010-2025-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Accepted: 09/15/2010] [Indexed: 11/30/2022]
Abstract
BACKGROUND 'Party Pills' containing trifluoromethylphenylpiperazine (TFMPP) and benzylpiperazine are legally available in many countries and marketed as safe alternatives to other illicit substances such as methamphetamine and methylenedioxymethamphetamine (or Ecstasy). They have gained huge popularity around the world, especially amongst young adults. However, there is no information currently available describing the acute neurophysiological effects of these psychoactive drugs in humans. The purpose of this study is to investigate the effects of TFMPP on central information processing speed in humans. METHODS A randomised, double blind, placebo-controlled study using electroencephalography (EEG) was carried out to investigate the effects of TFMPP on interhemispheric transfer time (IHTT). Healthy, right-handed males (age: 25 ± 5.6 years) were given placebo (n = 15) or TFMPP (0.94 mg/kg, oral, n = 15) and tested both pre- and 2 h post-drug administration. High-density EEG recordings (128 channels which were re-referenced using an average reference to make 129 electrodes) were used to record event-related potentials. The N160 component was defined as the biggest negative peak in the range between 140 and 220 ms after the event. The IHHTs were analysed by deducting the N160 latency obtained in the contralateral hemisphere from the N160 latency obtained in the hemisphere ipsilateral to stimulus signal. RESULTS Statistical analysis using a split-plot design analysis of variance revealed that TFMPP significantly reduced the IHTT but did not affect reaction time. No statistically significant changes were observed in the placebo group. CONCLUSIONS This study is the first to report the neurophysiological effects of TFMPP in humans and suggests that TFMPP may affect transmitter systems involved in speeding of interhemispheric communication in the male brain.
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Affiliation(s)
- HeeSeung Lee
- School of Pharmacy, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
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16
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Lim VK, Wilson AJ, Hamm JP, Phillips N, Iwabuchi SJ, Corballis MC, Arzarello F, Thomas MOJ. Semantic processing of mathematical gestures. Brain Cogn 2009; 71:306-12. [PMID: 19665831 DOI: 10.1016/j.bandc.2009.07.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2008] [Revised: 06/11/2009] [Accepted: 07/13/2009] [Indexed: 10/20/2022]
Abstract
OBJECTIVE To examine whether or not university mathematics students semantically process gestures depicting mathematical functions (mathematical gestures) similarly to the way they process action gestures and sentences. Semantic processing was indexed by the N400 effect. RESULTS The N400 effect elicited by words primed with mathematical gestures (e.g. "converging" and "decreasing") was the same in amplitude, latency and topography as that elicited by words primed with action gestures (e.g. drive and lift), and that for terminal words of sentences. SIGNIFICANCE AND CONCLUSION Findings provide a within-subject demonstration that the topographies of the gesture N400 effect for both action and mathematical words are indistinguishable from that of the standard language N400 effect. This suggests that mathematical function words are processed by the general language semantic system and do not appear to involve areas involved in other mathematical concepts (e.g. numerosity).
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Affiliation(s)
- Vanessa K Lim
- Department of Psychology, Research Centre for Cognitive Neuroscience, The University of Auckland, Auckland, New Zealand.
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Abstract
Investigating the neural substrates of auditory processing of absolute pitch musicians has relevance for understanding the capabilities of the human brain for plasticity. Electroencephalography was used to examine the N1 of auditory-evoked potentials from absolute pitch musicians, nonabsolute pitch musicians, and nonmusicians during tone labeling tasks with and without presentation of a reference tone. Source localization using low-resolution electromagnetic tomography revealed that when labeling tones without a reference, absolute pitch musicians generated greater activity than nonabsolute pitch musicians in the left and right hemispheres. This suggests that when required to label tones without an external reference, absolute pitch musicians have the ability to recruit a greater network than nonabsolute pitch musicians or nonmusicians.
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Horrobin SL, McNair NA, Kirk IJ, Waldie KE. Dexamphetamine normalises electrophysiological activity in attention deficit-hyperactivity disorder during the Stroop task. Neurocase 2007; 13:301-10. [PMID: 18781428 DOI: 10.1080/13554790701770850] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
A case study was conducted to investigate whether dexamphetamine enhances interference control in an adult with attention deficit/hyperactivity disorder. Continuous electroencephalography was recorded both on and off dexamphetamine during performance on a Stroop task. An age-, gender- and IQ-matched control also completed the same task. Event related potentials for the control participant revealed a positive potential to incongruent stimuli between 270 and 440 ms, whereas for the participant with attention deficit/hyperactivity disorder off medication, the reverse polarity was observed in a later time window. Following administration of dexamphetamine, however, the event-related potentials for the incongruent condition closely resembled those in the control, suggesting that dexamphetamine successfully normalises electroencephalographic activity.
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Affiliation(s)
- S L Horrobin
- Department of Psychology, Research Centre for Cognitive Neuroscience, University of Auckland, Auckland, New Zealand
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O'Connor K, Hamm JP, Kirk IJ. Neurophysiological responses to face, facial regions and objects in adults with Asperger's syndrome: An ERP investigation. Int J Psychophysiol 2007; 63:283-93. [PMID: 17267061 DOI: 10.1016/j.ijpsycho.2006.12.001] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2005] [Revised: 10/13/2006] [Accepted: 12/01/2006] [Indexed: 12/28/2022]
Abstract
Face processing differences have been observed between AS and control subjects at the behavioural and neurological levels. The purpose of the present study was to investigate the neurophysiological basis of processing faces and facial features (eyes and mouths) in adults with AS relative to age- and gender-matched typically-developing controls. These results were compared with ERPs generated to objects in both groups to determine if any differences were specific to facial stimuli. Although both groups elicited earlier N170 latencies to faces than to face parts and to eyes relative to mouths, adults with AS exhibited delayed N170 latencies to faces and face parts relative to controls. This difference was not observed to objects. Together these findings suggest that adults with AS may be slower to process facial information.
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Affiliation(s)
- Kate O'Connor
- Department of Psychology, University of Auckland, Auckland, New Zealand.
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Fairhall SL, Kirk IJ, Hamm JP. Volition and the idle cortex: beta oscillatory activity preceding planned and spontaneous movement. Conscious Cogn 2006; 16:221-8. [PMID: 16891124 DOI: 10.1016/j.concog.2006.05.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2005] [Revised: 03/26/2006] [Accepted: 05/18/2006] [Indexed: 11/16/2022]
Abstract
Prior to the initiation of spontaneous movement, evoked potentials can be seen to precede awareness of the impending movement by several hundreds of milliseconds, meaning that this recorded neural activity is the result of unconscious processing. This study investigates the neural representations of impending movement with and without awareness. Specifically, the relationship between awareness and 'idling' cortical oscillations in the beta range (18-24Hz) was assessed. It was found that, in situations where there was awareness of the impending movement, pre-movement evoked potentials were associated with a decrease in beta range oscillations. In contrast, when awareness of the impending movement was not present, the onset of the pre-movement potential was associated with tonic levels of beta range oscillations. A model is considered where by distributed neural activity remains outside of conscious awareness through the persistence of tonic slow wave cortical oscillations.
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Affiliation(s)
- Scott L Fairhall
- Research Centre for Cognitive Neuroscience, Department of Psychology, The University of Auckland, Auckland, New Zealand.
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Hautus MJ, Johnson BW. Object-related brain potentials associated with the perceptual segregation of a dichotically embedded pitch. J Acoust Soc Am 2005; 117:275-280. [PMID: 15704420 DOI: 10.1121/1.1828499] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The cortical mechanisms of perceptual segregation of concurrent sound sources were examined, based on binaural detection of interaural timing differences. Auditory event-related potentials were measured from 11 healthy subjects. Binaural stimuli were created by introducing a dichotic delay of 500-ms duration to a narrow frequency region within a broadband noise, and resulted in a perception of a centrally located noise and a right-lateralized pitch (dichotic pitch). In separate listening conditions, subjects actively discriminated and responded to randomly interleaved binaural and control stimuli, or ignored random stimuli while watching silent cartoons. In a third listening condition subjects ignored stimuli presented in homogenous blocks. For all listening conditions, the dichotic pitch stimulus elicited an object-related negativity (ORN) at a latency of about 150-250 ms after stimulus onset. When subjects were required to actively respond to stimuli, the ORN was followed by a P400 wave with a latency of about 320-420 ms. These results support and extend a two-stage model of auditory scene analysis in which acoustic streams are automatically parsed into component sound sources based on source-relevant cues, followed by a controlled process involving identification and generation of a behavioral response.
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Affiliation(s)
- Michael J Hautus
- Department of Psychology, University of Auckland, Auckland, New Zealand.
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Nagano A, Komura T, Himeno R, Fukashiro S. Optimal Digital Filter Cutoff Frequency of Jumping Kinematics Evaluated Through Computer Simulation. ACTA ACUST UNITED AC 2003; 1:196-201. [DOI: 10.5432/ijshs.1.196] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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