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Cortical Dynamics of Acoustic and Phonological Processing in Speech Perception
In speech perception, a functional hierarchy has been proposed by recent functional neuroimaging studies: Core auditory areas on the dorsal plane of superior temporal gyrus (STG) are sensitive to basic acoustic characteristics, whereas downstream regions, specifically the left superior temporal sulc...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2011
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3113809/ https://www.ncbi.nlm.nih.gov/pubmed/21695133 http://dx.doi.org/10.1371/journal.pone.0020963 |
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author | Zhang, Linjun Xi, Jie Xu, Guoqing Shu, Hua Wang, Xiaoyi Li, Ping |
author_facet | Zhang, Linjun Xi, Jie Xu, Guoqing Shu, Hua Wang, Xiaoyi Li, Ping |
author_sort | Zhang, Linjun |
collection | PubMed |
description | In speech perception, a functional hierarchy has been proposed by recent functional neuroimaging studies: Core auditory areas on the dorsal plane of superior temporal gyrus (STG) are sensitive to basic acoustic characteristics, whereas downstream regions, specifically the left superior temporal sulcus (STS) and middle temporal gyrus (MTG) ventral to Heschl's gyrus (HG) are responsive to abstract phonological features. What is unclear so far is the relationship between the dorsal and ventral processes, especially with regard to whether low-level acoustic processing is modulated by high-level phonological processing. To address the issue, we assessed sensitivity of core auditory and downstream regions to acoustic and phonological variations by using within- and across-category lexical tonal continua with equal physical intervals. We found that relative to within-category variation, across-category variation elicited stronger activation in the left middle MTG (mMTG), apparently reflecting the abstract phonological representations. At the same time, activation in the core auditory region decreased, resulting from the top-down influences of phonological processing. These results support a hierarchical organization of the ventral acoustic-phonological processing stream, which originates in the right HG/STG and projects to the left mMTG. Furthermore, our study provides direct evidence that low-level acoustic analysis is modulated by high-level phonological representations, revealing the cortical dynamics of acoustic and phonological processing in speech perception. Our findings confirm the existence of reciprocal progression projections in the auditory pathways and the roles of both feed-forward and feedback mechanisms in speech perception. |
format | Online Article Text |
id | pubmed-3113809 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-31138092011-06-21 Cortical Dynamics of Acoustic and Phonological Processing in Speech Perception Zhang, Linjun Xi, Jie Xu, Guoqing Shu, Hua Wang, Xiaoyi Li, Ping PLoS One Research Article In speech perception, a functional hierarchy has been proposed by recent functional neuroimaging studies: Core auditory areas on the dorsal plane of superior temporal gyrus (STG) are sensitive to basic acoustic characteristics, whereas downstream regions, specifically the left superior temporal sulcus (STS) and middle temporal gyrus (MTG) ventral to Heschl's gyrus (HG) are responsive to abstract phonological features. What is unclear so far is the relationship between the dorsal and ventral processes, especially with regard to whether low-level acoustic processing is modulated by high-level phonological processing. To address the issue, we assessed sensitivity of core auditory and downstream regions to acoustic and phonological variations by using within- and across-category lexical tonal continua with equal physical intervals. We found that relative to within-category variation, across-category variation elicited stronger activation in the left middle MTG (mMTG), apparently reflecting the abstract phonological representations. At the same time, activation in the core auditory region decreased, resulting from the top-down influences of phonological processing. These results support a hierarchical organization of the ventral acoustic-phonological processing stream, which originates in the right HG/STG and projects to the left mMTG. Furthermore, our study provides direct evidence that low-level acoustic analysis is modulated by high-level phonological representations, revealing the cortical dynamics of acoustic and phonological processing in speech perception. Our findings confirm the existence of reciprocal progression projections in the auditory pathways and the roles of both feed-forward and feedback mechanisms in speech perception. Public Library of Science 2011-06-13 /pmc/articles/PMC3113809/ /pubmed/21695133 http://dx.doi.org/10.1371/journal.pone.0020963 Text en Zhang et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. |
spellingShingle | Research Article Zhang, Linjun Xi, Jie Xu, Guoqing Shu, Hua Wang, Xiaoyi Li, Ping Cortical Dynamics of Acoustic and Phonological Processing in Speech Perception |
title | Cortical Dynamics of Acoustic and Phonological Processing in Speech Perception |
title_full | Cortical Dynamics of Acoustic and Phonological Processing in Speech Perception |
title_fullStr | Cortical Dynamics of Acoustic and Phonological Processing in Speech Perception |
title_full_unstemmed | Cortical Dynamics of Acoustic and Phonological Processing in Speech Perception |
title_short | Cortical Dynamics of Acoustic and Phonological Processing in Speech Perception |
title_sort | cortical dynamics of acoustic and phonological processing in speech perception |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3113809/ https://www.ncbi.nlm.nih.gov/pubmed/21695133 http://dx.doi.org/10.1371/journal.pone.0020963 |
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