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...

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Autores principales:	Linjun Zhang, Jie Xi, Guoqing Xu, Hua Shu, Xiaoyi Wang, Ping Li
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/758cfd8eb84c48de9dccdf57a2010f68
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id	oai:doaj.org-article:758cfd8eb84c48de9dccdf57a2010f68
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spelling	oai:doaj.org-article:758cfd8eb84c48de9dccdf57a2010f682021-11-18T06:52:13ZCortical dynamics of acoustic and phonological processing in speech perception.1932-620310.1371/journal.pone.0020963https://doaj.org/article/758cfd8eb84c48de9dccdf57a2010f682011-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21695133/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203In 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.Linjun ZhangJie XiGuoqing XuHua ShuXiaoyi WangPing LiPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 6, Iss 6, p e20963 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Linjun Zhang Jie Xi Guoqing Xu Hua Shu Xiaoyi Wang Ping Li Cortical dynamics of acoustic and phonological processing in speech perception.
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	article
author	Linjun Zhang Jie Xi Guoqing Xu Hua Shu Xiaoyi Wang Ping Li
author_facet	Linjun Zhang Jie Xi Guoqing Xu Hua Shu Xiaoyi Wang Ping Li
author_sort	Linjun Zhang
title	Cortical dynamics of acoustic and phonological processing in speech perception.
title_short	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_sort	cortical dynamics of acoustic and phonological processing in speech perception.
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/758cfd8eb84c48de9dccdf57a2010f68
work_keys_str_mv	AT linjunzhang corticaldynamicsofacousticandphonologicalprocessinginspeechperception AT jiexi corticaldynamicsofacousticandphonologicalprocessinginspeechperception AT guoqingxu corticaldynamicsofacousticandphonologicalprocessinginspeechperception AT huashu corticaldynamicsofacousticandphonologicalprocessinginspeechperception AT xiaoyiwang corticaldynamicsofacousticandphonologicalprocessinginspeechperception AT pingli corticaldynamicsofacousticandphonologicalprocessinginspeechperception
_version_	1718424301224329216

Cortical dynamics of acoustic and phonological processing in speech perception.

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