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Arai T, Komano T, Munakata T, Ohira H. The association between interoception and olfactory affective responses. Biol Psychol 2024; 193:108878. [PMID: 39341544 DOI: 10.1016/j.biopsycho.2024.108878] [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: 05/09/2024] [Revised: 09/15/2024] [Accepted: 09/21/2024] [Indexed: 10/01/2024]
Abstract
Odors are known to affect an individual's emotions and physiological states. Recent research has revealed that olfaction is linked to the mental representation of internal sensations, known as interoception. However, little research has examined how interoception relates to emotional responses to odors. This research aimed to fill this gap in the literature. We conducted two studies with a total of 548 Japanese women (n = 500 and n = 48 in Studies 1 and 2, respectively). Study 1 used an online survey to assess the relationship between self-reported interoceptive traits and the intensity of positive emotions in response to daily odors. Study 2 examined how self-reported interoceptive traits modulated the arousal ratings of odors presented in the laboratory and the concordance between these perceived arousal ratings and odor-evoked physiological responses. Study 1 confirmed that self-reported interoceptive traits were significant predictors of positive emotional intensity of odors. In Study 2, individuals with high interoceptive measure scores showed concordance between their perceived emotional arousal and the physiological responses associated with that emotion, whereas individuals with low scores did not. These findings suggest that how people perceive their internal sensations contributes to shaping their olfactory affective experiences, thereby broadening the scope of interoception research and aromachology. The practical implications of these findings for the development of commercial fragrances are discussed.
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Affiliation(s)
- Tomohiro Arai
- Shiseido Co., Ltd. MIRAI Technology Institute, Yokohama, Japan; Graduate School of Informatics, Nagoya University, Nagoya, Japan.
| | - Tomoko Komano
- Shiseido Co., Ltd. Brand Value R&D Institute, Yokohama, Japan
| | - Taro Munakata
- Shiseido Co., Ltd. MIRAI Technology Institute, Yokohama, Japan
| | - Hideki Ohira
- Graduate School of Informatics, Nagoya University, Nagoya, Japan
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Gil-Guevara O, Riveros AJ. Stimulus intensity and temporal configuration interact during bimodal learning and memory in honey bees. PLoS One 2024; 19:e0309129. [PMID: 39361581 PMCID: PMC11449348 DOI: 10.1371/journal.pone.0309129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 08/07/2024] [Indexed: 10/05/2024] Open
Abstract
Multimodal integration is a core neural process with a keen relevance during ecological tasks requiring learning and memory, such as foraging. The benefits of learning multimodal signals imply solving whether the components come from a single event. This challenge presumably depends on the timing and intensity of the stimuli. Here, we used simultaneous and alternate presentations of olfactory and visual stimuli, at low and high intensities, to understand how temporal and intensity variations affect the learning of a bimodal stimulus and its components. We relied on the conditioning of the proboscis extension response (PER) to train honey bees to an appetitive learning task with bimodal stimuli precisely controlled. We trained bees to stimuli with different synchronicity and intensity levels. We found that synchronicity, order of presentation, and intensity significantly impacted the probability of exhibiting conditioned PER responses and the latency of the conditioned responses. At low intensities, synchronous bimodal inputs produced maximal multisensory enhancement, while asynchronous temporal orders led to lower performances. At high intensities, the relative advantage of the synchronous stimulation diminished, and asynchronous stimuli produced similar performances. Memory retention was higher for the olfactory component and bimodal stimuli compared to the visual component, irrespective of the training's temporal configuration. Bees retained the asynchronous bimodal configuration to a lesser extent than the synchronous one, depending on the stimulus intensity. We conclude that time (synchrony), order of presentation, and intensity have interdependent effects on bee learning and memory performance. This suggests caution when assessing the independent effects of each factor.
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Affiliation(s)
- Oswaldo Gil-Guevara
- Departamento de Biología, Facultad de Ciencias Naturales, Universidad del Rosario, Bogotá, Colombia
| | - Andre J. Riveros
- Departamento de Biología, Facultad de Ciencias Naturales, Universidad del Rosario, Bogotá, Colombia
- Department of Neuroscience, College of Science, University of Arizona, Tucson, AZ, United States of America
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Ishimaru T, Ishimaru H. Potential application of electronic odor diffuser in olfaction testing. Auris Nasus Larynx 2024; 51:507-511. [PMID: 38522354 DOI: 10.1016/j.anl.2023.12.004] [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: 06/30/2023] [Revised: 12/11/2023] [Accepted: 12/15/2023] [Indexed: 03/26/2024]
Abstract
OBJECTIVE Different olfactory tests have been performed by otorhinolaryngologists in different parts of the world. For example, the University of Pennsylvania Smell Identification Test (UPSIT) has been used in the U.S., whereas the Sniffin' Sticks Test has been used in Europe, and similarly, T&T olfactometry is used in Japan. Although audiometers with electronic oscillators have long been used in hearing tests, electronic odor generators are not typically used in olfaction tests. We attempted an olfactory test using the AROMASTIC® (SONY, Tokyo, Japan), an electronically controlled device that can diffuse five different odors. METHODS Forty participants who had visited an outpatient olfactory clinic were included in this study. The participants were instructed to answer whether they could smell the five different odors during the AROMASTIC® screening test (AS-test), and the number of odors smelled was summed and scored (AS-score). The patients also underwent T&T olfactometry concurrently. RESULTS The AS-scores and T&T olfactometry detection and recognition thresholds showed significant correlations, confirming that the AS-test is a valid olfactory test. CONCLUSION Electronic odor diffusers may be useful for olfaction tests.
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Affiliation(s)
- Tadashi Ishimaru
- Department of Otorhinolaryngology, Hyotan-machi ENT Clinic, Kanazawa, Ishikawa, Japan.
| | - Hitomi Ishimaru
- Department of Otorhinolaryngology, Hyotan-machi ENT Clinic, Kanazawa, Ishikawa, Japan
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Vance DE, Del Bene VA, Kamath V, Frank JS, Billings R, Cho DY, Byun JY, Jacob A, Anderson JN, Visscher K, Triebel K, Martin KM, Li W, Puga F, Fazeli PL. Does Olfactory Training Improve Brain Function and Cognition? A Systematic Review. Neuropsychol Rev 2024; 34:155-191. [PMID: 36725781 PMCID: PMC9891899 DOI: 10.1007/s11065-022-09573-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Accepted: 12/01/2022] [Indexed: 02/03/2023]
Abstract
Olfactory training (OT), or smell training,consists of repeated exposure to odorants over time with the intended neuroplastic effect of improving or remediating olfactory functioning. Declines in olfaction parallel declines in cognition in various pathological conditions and aging. Research suggests a dynamic neural connection exists between olfaction and cognition. Thus, if OT can improve olfaction, could OT also improve cognition and support brain function? To answer this question, we conducted a systematic review of the literature to determine whether there is evidence that OT translates to improved cognition or altered brain morphology and connectivity that supports cognition. Across three databases (MEDLINE, Scopus, & Embase), 18 articles were identified in this systematic review. Overall, the reviewed studies provided emerging evidence that OT is associated with improved global cognition, and in particular, verbal fluency and verbal learning/memory. OT is also associated with increases in the volume/size of olfactory-related brain regions, including the olfactory bulb and hippocampus, and altered functional connectivity. Interestingly, these positive effects were not limited to patients with smell loss (i.e., hyposmia & anosmia) but normosmic (i.e., normal ability to smell) participants benefitted as well. Implications for practice and research are provided.
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Affiliation(s)
- David E Vance
- School of Nursing, University of Alabama at Birmingham, 1701 University Boulevard, Birmingham, AL, USA.
| | - Victor A Del Bene
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Vidyulata Kamath
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University, Baltimore, MD, USA
| | - Jennifer Sandson Frank
- School of Nursing, University of Alabama at Birmingham, 1701 University Boulevard, Birmingham, AL, USA
| | - Rebecca Billings
- UAB Libraries, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Do-Yeon Cho
- Department of Surgery, Veterans Affairs, University of Alabama at Birmingham, & Division of Otolaryngology, Birmingham, AL, USA
| | - Jun Y Byun
- School of Nursing, University of Alabama at Birmingham, 1701 University Boulevard, Birmingham, AL, USA
| | - Alexandra Jacob
- Department of Psychology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Joseph N Anderson
- School of Medicine, Department of Neurology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Kristina Visscher
- Department of Neurobiology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Kristen Triebel
- School of Medicine, Department of Neurology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Karli M Martin
- School of Medicine, Department of Neurology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Wei Li
- Department of Clinical and Diagnostic Sciences, School of Health Professions, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Frank Puga
- School of Nursing, University of Alabama at Birmingham, 1701 University Boulevard, Birmingham, AL, USA
| | - Pariya L Fazeli
- School of Nursing, University of Alabama at Birmingham, 1701 University Boulevard, Birmingham, AL, USA
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Ma H, Fang H, Xie X, Liu Y, Tian H, Chai Y. Optoelectronic Synapses Based on MXene/Violet Phosphorus van der Waals Heterojunctions for Visual-Olfactory Crossmodal Perception. NANO-MICRO LETTERS 2024; 16:104. [PMID: 38300424 PMCID: PMC10834395 DOI: 10.1007/s40820-024-01330-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 12/11/2023] [Indexed: 02/02/2024]
Abstract
The crossmodal interaction of different senses, which is an important basis for learning and memory in the human brain, is highly desired to be mimicked at the device level for developing neuromorphic crossmodal perception, but related researches are scarce. Here, we demonstrate an optoelectronic synapse for vision-olfactory crossmodal perception based on MXene/violet phosphorus (VP) van der Waals heterojunctions. Benefiting from the efficient separation and transport of photogenerated carriers facilitated by conductive MXene, the photoelectric responsivity of VP is dramatically enhanced by 7 orders of magnitude, reaching up to 7.7 A W-1. Excited by ultraviolet light, multiple synaptic functions, including excitatory postsynaptic currents, paired-pulse facilitation, short/long-term plasticity and "learning-experience" behavior, were demonstrated with a low power consumption. Furthermore, the proposed optoelectronic synapse exhibits distinct synaptic behaviors in different gas environments, enabling it to simulate the interaction of visual and olfactory information for crossmodal perception. This work demonstrates the great potential of VP in optoelectronics and provides a promising platform for applications such as virtual reality and neurorobotics.
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Affiliation(s)
- Hailong Ma
- Center for Advancing Materials Performance From the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China
| | - Huajing Fang
- Center for Advancing Materials Performance From the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China.
| | - Xinxing Xie
- Center for Advancing Materials Performance From the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China
| | - Yanming Liu
- Institute of Microelectronics and Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing, 100084, People's Republic of China
| | - He Tian
- Institute of Microelectronics and Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing, 100084, People's Republic of China.
| | - Yang Chai
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, People's Republic of China.
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Thaploo D, Joshi A, Yilmaz E, Yildirim D, Altundag A, Hummel T. Functional connectivity patterns in parosmia. BEHAVIORAL AND BRAIN FUNCTIONS : BBF 2023; 19:24. [PMID: 38115149 PMCID: PMC10731743 DOI: 10.1186/s12993-023-00225-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 12/05/2023] [Indexed: 12/21/2023]
Abstract
OBJECTIVE Parosmia is a qualitative olfactory dysfunction presenting as "distorted odor perception" in presence of an odor source. Aim of this study was to use resting state functional connectivity to gain more information on the alteration of olfactory processing at the level of the central nervous system level. METHODS A cross sectional study was performed in 145 patients with parosmia (age range 20-76 years; 90 women). Presence and degree of parosmia was diagnosed on the basis of standardized questionnaires. Participants also received olfactory testing using the "Sniffin' Sticks". Then they underwent resting state scans using a 3 T magnetic resonance imaging scanner while fixating on a cross. RESULTS Whole brain analyses revealed reduced functional connectivity in salience as well as executive control networks. Region of interest-based analyses also supported reduced functional connectivity measures between primary and secondary olfactory eloquent areas (temporal pole, supramarginal gyrus and right orbitofrontal cortex; dorso-lateral pre-frontal cortex and the right piriform cortex). CONCLUSIONS Participants with parosmia exhibited a reduced information flow between memory, decision making centers, and primary and secondary olfactory areas.
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Affiliation(s)
- Divesh Thaploo
- Smell & Taste Clinic, Department of Otorhinolaryngology, Universitätsklinikum Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany.
| | - Akshita Joshi
- Smell & Taste Clinic, Department of Otorhinolaryngology, Universitätsklinikum Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Eren Yilmaz
- Faculty of Health Sciences, Istanbul Gelisim University, Istanbul, Turkey
| | - Duzgun Yildirim
- Department of Medical Imaging, Acibadem University, Vocational School of Health Sciences, Istanbul, Turkey
| | - Aytug Altundag
- Faculty of Medicine, Department of Otorhinolaryngology, Biruni University, Istanbul, Turkey
| | - Thomas Hummel
- Smell & Taste Clinic, Department of Otorhinolaryngology, Universitätsklinikum Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
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Schumann K, Rodriguez-Raecke R, Sijben R, Freiherr J. Elevated Insulin Levels Engage the Salience Network during Multisensory Perception. Neuroendocrinology 2023; 114:90-106. [PMID: 37634508 DOI: 10.1159/000533663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 08/14/2023] [Indexed: 08/29/2023]
Abstract
INTRODUCTION Brain insulin reactivity has been reported in connection with systematic energy metabolism, enhancement in cognition, olfactory sensitivity, and neuroendocrine circuits. High receptor densities exist in regions important for sensory processing. The main aim of the study was to examine whether intranasal insulin would modulate the activity of areas in charge of olfactory-visual integration. METHODS As approach, a placebo-controlled double-blind within crossover design was chosen. The experiments were conducted in a research unit of a university hospital. On separate mornings, twenty-six healthy normal-weight males aged between 19 and 31 years received either 40 IU intranasal insulin or placebo vehicle. Subsequently, they underwent 65 min of functional magnetic resonance imaging whilst performing an odor identification task. Functional brain activations of olfactory, visual, and multisensory integration as well as insulin versus placebo were assessed. Regarding the odor identification task, reaction time, accuracy, pleasantness, and intensity measurements were taken to examine the role of integration and treatment. Blood samples were drawn to control for peripheral hormone concentrations. RESULTS Intranasal insulin administration during olfactory-visual stimulation revealed strong bilateral engagement of frontoinsular cortices, anterior cingulate, prefrontal cortex, mediodorsal thalamus, striatal, and hippocampal regions (p ≤ 0.001 familywise error [FWE] corrected). In addition, the integration contrast showed increased activity in left intraparietal sulcus, left inferior frontal gyrus, left superior frontal gyrus, and left middle frontal gyrus (p ≤ 0.013 FWE corrected). CONCLUSIONS Intranasal insulin application in lean men led to enhanced activation in multisensory olfactory-visual integration sites and salience hubs which indicates stimuli valuation modulation. This effect can serve as a basis for understanding the connection of intracerebral insulin and olfactory-visual processing.
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Affiliation(s)
- Katja Schumann
- Diagnostic and Interventional Neuroradiology, RWTH Aachen University, Aachen, Germany
| | - Rea Rodriguez-Raecke
- Diagnostic and Interventional Neuroradiology, RWTH Aachen University, Aachen, Germany
- Brain Imaging Facility, Interdisciplinary Center for Clinical Research, RWTH Aachen University, Aachen, Germany
| | - Rik Sijben
- Brain Imaging Facility, Interdisciplinary Center for Clinical Research, RWTH Aachen University, Aachen, Germany
| | - Jessica Freiherr
- Department of Psychiatry and Psychotherapy, Friedrich-Alexander, University Erlangen-Nürnberg, Erlangen, Germany
- Fraunhofer Institute for Process Engineering and Packaging IVV, Freising, Germany
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Invitto S, Boscolo-Rizzo P, Fantin F, Bonifati DM, de Filippis C, Emanuelli E, Frezza D, Giopato F, Caggiula M, Schito A, Ciccarese V, Spinato G. Exploratory Study on Chemosensory Event-Related Potentials in Long COVID-19 and Mild Cognitive Impairment: A Common Pathway? Bioengineering (Basel) 2023; 10:bioengineering10030376. [PMID: 36978767 PMCID: PMC10045951 DOI: 10.3390/bioengineering10030376] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 03/13/2023] [Accepted: 03/17/2023] [Indexed: 03/30/2023] Open
Abstract
People affected by the Long COVID-19 (LC) syndrome often show clinical manifestations that are similar to those observed in patients with mild cognitive impairments (MCI), such as olfactory dysfunction (OD), brain fog, and cognitive and attentional diseases. This study aimed to investigate the chemosensory-evoked related potentials (CSERP) in LC and MCI to understand if there is a common pathway for the similarity of symptoms associated with these disorders. Eighteen LC patients (mean age 53; s.d. = 7), 12 patients diagnosed with MCI (mean age 67; s.d. = 6), and 10 healthy control subjects (mean age 66; s.d. = 5, 7) were recruited for this exploratory study. All of them performed a chemosensory event-related potentials (CSERP) task with the administration of trigeminal stimulations (e.g., the odorants cinnamaldehyde and eucalyptus). Study results highlighted that MCI and LC showed reduced N1 amplitude, particularly in the left frontoparietal network, involved in working memory and attentional deficits, and a reduction of P3 latency in LC. This study lays the foundations for evaluating aspects of LC as a process that could trigger long-term functional alterations, and CSERPs could be considered valid biomarkers for assessing the progress of OD and an indicator of other impairments (e.g., attentional and cognitive impairments), as they occur in MCI.
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Affiliation(s)
- Sara Invitto
- INSPIRE Lab, Laboratory on Cognitive and Psychophysiological Olfactory Processing, DiSTeBA, University of Salento, 73100 Lecce, Italy
| | - Paolo Boscolo-Rizzo
- Department of Medical, Surgical and Health Sciences, Section of Otolaryngology, University of Trieste, 34123 Trieste, Italy
| | - Francesco Fantin
- Department of Neuroscience DNS, Audiology Unit at Treviso Hospital, University of Padova, 31100 Treviso, Italy
| | - Domenico Marco Bonifati
- Unit of Neurology, Department of Neuro-Cardio-Vascular, Ca' Foncello Hospital, 31100 Treviso, Italy
| | - Cosimo de Filippis
- Department of Neuroscience DNS, University of Padova, Audiology and Phoniatrics Unit, Ca' Foncello Hospital, 31100 Treviso, Italy
| | - Enzo Emanuelli
- Otolaringology Unit, Ca' Foncello Hospital, Local Health Unit N.2 "Marca Trevigiana", 31100 Treviso, Italy
| | - Daniele Frezza
- Otolaringology Unit, Ca' Foncello Hospital, Local Health Unit N.2 "Marca Trevigiana", 31100 Treviso, Italy
| | - Federico Giopato
- Unit of Neurology, Department of Neuro-Cardio-Vascular, Ca' Foncello Hospital, 31100 Treviso, Italy
| | | | - Andrea Schito
- INSPIRE Lab, Laboratory on Cognitive and Psychophysiological Olfactory Processing, DiSTeBA, University of Salento, 73100 Lecce, Italy
- Istituto Santa Chiara, 73100 Lecce, Italy
| | | | - Giacomo Spinato
- Department of Neuroscience DNS, Section of Otorhinolaryngology, University of Padova, 35121 Padova, Italy
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