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Neural Correlates of Early Sound Encoding and their Relationship to Speech-in-Noise Perception

Speech-in-noise (SIN) perception is a complex cognitive skill that affects social, vocational, and educational activities. Poor SIN ability particularly affects young and elderly populations, yet varies considerably even among healthy young adults with normal hearing. Although SIN skills are known t...

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Autores principales: Coffey, Emily B. J., Chepesiuk, Alexander M. P., Herholz, Sibylle C., Baillet, Sylvain, Zatorre, Robert J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5575455/
https://www.ncbi.nlm.nih.gov/pubmed/28890684
http://dx.doi.org/10.3389/fnins.2017.00479
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author Coffey, Emily B. J.
Chepesiuk, Alexander M. P.
Herholz, Sibylle C.
Baillet, Sylvain
Zatorre, Robert J.
author_facet Coffey, Emily B. J.
Chepesiuk, Alexander M. P.
Herholz, Sibylle C.
Baillet, Sylvain
Zatorre, Robert J.
author_sort Coffey, Emily B. J.
collection PubMed
description Speech-in-noise (SIN) perception is a complex cognitive skill that affects social, vocational, and educational activities. Poor SIN ability particularly affects young and elderly populations, yet varies considerably even among healthy young adults with normal hearing. Although SIN skills are known to be influenced by top-down processes that can selectively enhance lower-level sound representations, the complementary role of feed-forward mechanisms and their relationship to musical training is poorly understood. Using a paradigm that minimizes the main top-down factors that have been implicated in SIN performance such as working memory, we aimed to better understand how robust encoding of periodicity in the auditory system (as measured by the frequency-following response) contributes to SIN perception. Using magnetoencephalograpy, we found that the strength of encoding at the fundamental frequency in the brainstem, thalamus, and cortex is correlated with SIN accuracy. The amplitude of the slower cortical P2 wave was previously also shown to be related to SIN accuracy and FFR strength; we use MEG source localization to show that the P2 wave originates in a temporal region anterior to that of the cortical FFR. We also confirm that the observed enhancements were related to the extent and timing of musicianship. These results are consistent with the hypothesis that basic feed-forward sound encoding affects SIN perception by providing better information to later processing stages, and that modifying this process may be one mechanism through which musical training might enhance the auditory networks that subserve both musical and language functions.
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spelling pubmed-55754552017-09-08 Neural Correlates of Early Sound Encoding and their Relationship to Speech-in-Noise Perception Coffey, Emily B. J. Chepesiuk, Alexander M. P. Herholz, Sibylle C. Baillet, Sylvain Zatorre, Robert J. Front Neurosci Neuroscience Speech-in-noise (SIN) perception is a complex cognitive skill that affects social, vocational, and educational activities. Poor SIN ability particularly affects young and elderly populations, yet varies considerably even among healthy young adults with normal hearing. Although SIN skills are known to be influenced by top-down processes that can selectively enhance lower-level sound representations, the complementary role of feed-forward mechanisms and their relationship to musical training is poorly understood. Using a paradigm that minimizes the main top-down factors that have been implicated in SIN performance such as working memory, we aimed to better understand how robust encoding of periodicity in the auditory system (as measured by the frequency-following response) contributes to SIN perception. Using magnetoencephalograpy, we found that the strength of encoding at the fundamental frequency in the brainstem, thalamus, and cortex is correlated with SIN accuracy. The amplitude of the slower cortical P2 wave was previously also shown to be related to SIN accuracy and FFR strength; we use MEG source localization to show that the P2 wave originates in a temporal region anterior to that of the cortical FFR. We also confirm that the observed enhancements were related to the extent and timing of musicianship. These results are consistent with the hypothesis that basic feed-forward sound encoding affects SIN perception by providing better information to later processing stages, and that modifying this process may be one mechanism through which musical training might enhance the auditory networks that subserve both musical and language functions. Frontiers Media S.A. 2017-08-25 /pmc/articles/PMC5575455/ /pubmed/28890684 http://dx.doi.org/10.3389/fnins.2017.00479 Text en Copyright © 2017 Coffey, Chepesiuk, Herholz, Baillet and Zatorre. http://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) or licensor 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
Coffey, Emily B. J.
Chepesiuk, Alexander M. P.
Herholz, Sibylle C.
Baillet, Sylvain
Zatorre, Robert J.
Neural Correlates of Early Sound Encoding and their Relationship to Speech-in-Noise Perception
title Neural Correlates of Early Sound Encoding and their Relationship to Speech-in-Noise Perception
title_full Neural Correlates of Early Sound Encoding and their Relationship to Speech-in-Noise Perception
title_fullStr Neural Correlates of Early Sound Encoding and their Relationship to Speech-in-Noise Perception
title_full_unstemmed Neural Correlates of Early Sound Encoding and their Relationship to Speech-in-Noise Perception
title_short Neural Correlates of Early Sound Encoding and their Relationship to Speech-in-Noise Perception
title_sort neural correlates of early sound encoding and their relationship to speech-in-noise perception
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5575455/
https://www.ncbi.nlm.nih.gov/pubmed/28890684
http://dx.doi.org/10.3389/fnins.2017.00479
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