Ear-Specific Hemispheric Asymmetry in Unilateral Deafness Revealed by Auditory Cortical Activity

Profound unilateral deafness reduces the ability to localize sounds achieved via binaural hearing. Furthermore, unilateral deafness promotes a substantial change in cortical processing to binaural stimulation, thereby leading to reorganization over the whole brain. Although distinct patterns in the...

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Autores principales:	Ji-Hye Han, Jihyun Lee, Hyo-Jeong Lee
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	unilateral deafness hemispheric asymmetry auditory spatial processing sound localization unilateral hearing loss (UHL) Neurosciences. Biological psychiatry. Neuropsychiatry RC321-571
Acceso en línea:	https://doaj.org/article/3ed4ee34142a4fae8d51e244894d481b
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spelling	oai:doaj.org-article:3ed4ee34142a4fae8d51e244894d481b2021-11-05T23:36:59ZEar-Specific Hemispheric Asymmetry in Unilateral Deafness Revealed by Auditory Cortical Activity1662-453X10.3389/fnins.2021.698718https://doaj.org/article/3ed4ee34142a4fae8d51e244894d481b2021-07-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fnins.2021.698718/fullhttps://doaj.org/toc/1662-453XProfound unilateral deafness reduces the ability to localize sounds achieved via binaural hearing. Furthermore, unilateral deafness promotes a substantial change in cortical processing to binaural stimulation, thereby leading to reorganization over the whole brain. Although distinct patterns in the hemispheric laterality depending on the side and duration of deafness have been suggested, the neurological mechanisms underlying the difference in relation to behavioral performance when detecting spatially varied cues remain unknown. To elucidate the mechanism, we compared N1/P2 auditory cortical activities and the pattern of hemispheric asymmetry of normal hearing, unilaterally deaf (UD), and simulated acute unilateral hearing loss groups while passively listening to speech sounds delivered from different locations under open free field condition. The behavioral performances of the participants concerning sound localization were measured by detecting sound sources in the azimuth plane. The results reveal a delayed reaction time in the right-sided UD (RUD) group for the sound localization task and prolonged P2 latency compared to the left-sided UD (LUD) group. Moreover, the RUD group showed adaptive cortical reorganization evidenced by increased responses in the hemisphere ipsilateral to the intact ear for individuals with better sound localization whereas left-sided unilateral deafness caused contralateral dominance in activity from the hearing ear. The brain dynamics of right-sided unilateral deafness indicate greater capability of adaptive change to compensate for impairment in spatial hearing. In addition, cortical N1 responses to spatially varied speech sounds in unilateral deaf people were inversely related to the duration of deafness in the area encompassing the right auditory cortex, indicating that early intervention would be needed to protect from maladaptation of the central auditory system following unilateral deafness.Ji-Hye HanJihyun LeeHyo-Jeong LeeHyo-Jeong LeeFrontiers Media S.A.articleunilateral deafnesshemispheric asymmetryauditory spatial processingsound localizationunilateral hearing loss (UHL)Neurosciences. Biological psychiatry. NeuropsychiatryRC321-571ENFrontiers in Neuroscience, Vol 15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	unilateral deafness hemispheric asymmetry auditory spatial processing sound localization unilateral hearing loss (UHL) Neurosciences. Biological psychiatry. Neuropsychiatry RC321-571
spellingShingle	unilateral deafness hemispheric asymmetry auditory spatial processing sound localization unilateral hearing loss (UHL) Neurosciences. Biological psychiatry. Neuropsychiatry RC321-571 Ji-Hye Han Jihyun Lee Hyo-Jeong Lee Hyo-Jeong Lee Ear-Specific Hemispheric Asymmetry in Unilateral Deafness Revealed by Auditory Cortical Activity
description	Profound unilateral deafness reduces the ability to localize sounds achieved via binaural hearing. Furthermore, unilateral deafness promotes a substantial change in cortical processing to binaural stimulation, thereby leading to reorganization over the whole brain. Although distinct patterns in the hemispheric laterality depending on the side and duration of deafness have been suggested, the neurological mechanisms underlying the difference in relation to behavioral performance when detecting spatially varied cues remain unknown. To elucidate the mechanism, we compared N1/P2 auditory cortical activities and the pattern of hemispheric asymmetry of normal hearing, unilaterally deaf (UD), and simulated acute unilateral hearing loss groups while passively listening to speech sounds delivered from different locations under open free field condition. The behavioral performances of the participants concerning sound localization were measured by detecting sound sources in the azimuth plane. The results reveal a delayed reaction time in the right-sided UD (RUD) group for the sound localization task and prolonged P2 latency compared to the left-sided UD (LUD) group. Moreover, the RUD group showed adaptive cortical reorganization evidenced by increased responses in the hemisphere ipsilateral to the intact ear for individuals with better sound localization whereas left-sided unilateral deafness caused contralateral dominance in activity from the hearing ear. The brain dynamics of right-sided unilateral deafness indicate greater capability of adaptive change to compensate for impairment in spatial hearing. In addition, cortical N1 responses to spatially varied speech sounds in unilateral deaf people were inversely related to the duration of deafness in the area encompassing the right auditory cortex, indicating that early intervention would be needed to protect from maladaptation of the central auditory system following unilateral deafness.
format	article
author	Ji-Hye Han Jihyun Lee Hyo-Jeong Lee Hyo-Jeong Lee
author_facet	Ji-Hye Han Jihyun Lee Hyo-Jeong Lee Hyo-Jeong Lee
author_sort	Ji-Hye Han
title	Ear-Specific Hemispheric Asymmetry in Unilateral Deafness Revealed by Auditory Cortical Activity
title_short	Ear-Specific Hemispheric Asymmetry in Unilateral Deafness Revealed by Auditory Cortical Activity
title_full	Ear-Specific Hemispheric Asymmetry in Unilateral Deafness Revealed by Auditory Cortical Activity
title_fullStr	Ear-Specific Hemispheric Asymmetry in Unilateral Deafness Revealed by Auditory Cortical Activity
title_full_unstemmed	Ear-Specific Hemispheric Asymmetry in Unilateral Deafness Revealed by Auditory Cortical Activity
title_sort	ear-specific hemispheric asymmetry in unilateral deafness revealed by auditory cortical activity
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/3ed4ee34142a4fae8d51e244894d481b
work_keys_str_mv	AT jihyehan earspecifichemisphericasymmetryinunilateraldeafnessrevealedbyauditorycorticalactivity AT jihyunlee earspecifichemisphericasymmetryinunilateraldeafnessrevealedbyauditorycorticalactivity AT hyojeonglee earspecifichemisphericasymmetryinunilateraldeafnessrevealedbyauditorycorticalactivity AT hyojeonglee earspecifichemisphericasymmetryinunilateraldeafnessrevealedbyauditorycorticalactivity
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Ear-Specific Hemispheric Asymmetry in Unilateral Deafness Revealed by Auditory Cortical Activity

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