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Functional Plasticity Coupled With Structural Predispositions in Auditory Cortex Shape Successful Music Category Learning

Categorizing sounds into meaningful groups helps listeners more efficiently process the auditory scene and is a foundational skill for speech perception and language development. Yet, how auditory categories develop in the brain through learning, particularly for non-speech sounds (e.g., music), is...

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Autores principales: Mankel, Kelsey, Shrestha, Utsav, Tipirneni-Sajja, Aaryani, Bidelman, Gavin M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9274125/
https://www.ncbi.nlm.nih.gov/pubmed/35837119
http://dx.doi.org/10.3389/fnins.2022.897239
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author Mankel, Kelsey
Shrestha, Utsav
Tipirneni-Sajja, Aaryani
Bidelman, Gavin M.
author_facet Mankel, Kelsey
Shrestha, Utsav
Tipirneni-Sajja, Aaryani
Bidelman, Gavin M.
author_sort Mankel, Kelsey
collection PubMed
description Categorizing sounds into meaningful groups helps listeners more efficiently process the auditory scene and is a foundational skill for speech perception and language development. Yet, how auditory categories develop in the brain through learning, particularly for non-speech sounds (e.g., music), is not well understood. Here, we asked musically naïve listeners to complete a brief (∼20 min) training session where they learned to identify sounds from a musical interval continuum (minor-major 3rds). We used multichannel EEG to track behaviorally relevant neuroplastic changes in the auditory event-related potentials (ERPs) pre- to post-training. To rule out mere exposure-induced changes, neural effects were evaluated against a control group of 14 non-musicians who did not undergo training. We also compared individual categorization performance with structural volumetrics of bilateral Heschl’s gyrus (HG) from MRI to evaluate neuroanatomical substrates of learning. Behavioral performance revealed steeper (i.e., more categorical) identification functions in the posttest that correlated with better training accuracy. At the neural level, improvement in learners’ behavioral identification was characterized by smaller P2 amplitudes at posttest, particularly over right hemisphere. Critically, learning-related changes in the ERPs were not observed in control listeners, ruling out mere exposure effects. Learners also showed smaller and thinner HG bilaterally, indicating superior categorization was associated with structural differences in primary auditory brain regions. Collectively, our data suggest successful auditory categorical learning of music sounds is characterized by short-term functional changes (i.e., greater post-training efficiency) in sensory coding processes superimposed on preexisting structural differences in bilateral auditory cortex.
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spelling pubmed-92741252022-07-13 Functional Plasticity Coupled With Structural Predispositions in Auditory Cortex Shape Successful Music Category Learning Mankel, Kelsey Shrestha, Utsav Tipirneni-Sajja, Aaryani Bidelman, Gavin M. Front Neurosci Neuroscience Categorizing sounds into meaningful groups helps listeners more efficiently process the auditory scene and is a foundational skill for speech perception and language development. Yet, how auditory categories develop in the brain through learning, particularly for non-speech sounds (e.g., music), is not well understood. Here, we asked musically naïve listeners to complete a brief (∼20 min) training session where they learned to identify sounds from a musical interval continuum (minor-major 3rds). We used multichannel EEG to track behaviorally relevant neuroplastic changes in the auditory event-related potentials (ERPs) pre- to post-training. To rule out mere exposure-induced changes, neural effects were evaluated against a control group of 14 non-musicians who did not undergo training. We also compared individual categorization performance with structural volumetrics of bilateral Heschl’s gyrus (HG) from MRI to evaluate neuroanatomical substrates of learning. Behavioral performance revealed steeper (i.e., more categorical) identification functions in the posttest that correlated with better training accuracy. At the neural level, improvement in learners’ behavioral identification was characterized by smaller P2 amplitudes at posttest, particularly over right hemisphere. Critically, learning-related changes in the ERPs were not observed in control listeners, ruling out mere exposure effects. Learners also showed smaller and thinner HG bilaterally, indicating superior categorization was associated with structural differences in primary auditory brain regions. Collectively, our data suggest successful auditory categorical learning of music sounds is characterized by short-term functional changes (i.e., greater post-training efficiency) in sensory coding processes superimposed on preexisting structural differences in bilateral auditory cortex. Frontiers Media S.A. 2022-06-28 /pmc/articles/PMC9274125/ /pubmed/35837119 http://dx.doi.org/10.3389/fnins.2022.897239 Text en Copyright © 2022 Mankel, Shrestha, Tipirneni-Sajja and Bidelman. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Neuroscience
Mankel, Kelsey
Shrestha, Utsav
Tipirneni-Sajja, Aaryani
Bidelman, Gavin M.
Functional Plasticity Coupled With Structural Predispositions in Auditory Cortex Shape Successful Music Category Learning
title Functional Plasticity Coupled With Structural Predispositions in Auditory Cortex Shape Successful Music Category Learning
title_full Functional Plasticity Coupled With Structural Predispositions in Auditory Cortex Shape Successful Music Category Learning
title_fullStr Functional Plasticity Coupled With Structural Predispositions in Auditory Cortex Shape Successful Music Category Learning
title_full_unstemmed Functional Plasticity Coupled With Structural Predispositions in Auditory Cortex Shape Successful Music Category Learning
title_short Functional Plasticity Coupled With Structural Predispositions in Auditory Cortex Shape Successful Music Category Learning
title_sort functional plasticity coupled with structural predispositions in auditory cortex shape successful music category learning
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9274125/
https://www.ncbi.nlm.nih.gov/pubmed/35837119
http://dx.doi.org/10.3389/fnins.2022.897239
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