Top-down influences of the medial olivocochlear efferent system in speech perception in noise.

One of the putative functions of the medial olivocochlear (MOC) system is to enhance signal detection in noise. The objective of this study was to elucidate the role of the MOC system in speech perception in noise. In normal-hearing human listeners, we examined (1) the association between magnitude...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Srikanta K Mishra, Mark E Lutman
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/fccfa7d26c504c739785ff6ae08f309f
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:fccfa7d26c504c739785ff6ae08f309f
record_format	dspace
spelling	oai:doaj.org-article:fccfa7d26c504c739785ff6ae08f309f2021-11-18T08:37:15ZTop-down influences of the medial olivocochlear efferent system in speech perception in noise.1932-620310.1371/journal.pone.0085756https://doaj.org/article/fccfa7d26c504c739785ff6ae08f309f2014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24465686/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203One of the putative functions of the medial olivocochlear (MOC) system is to enhance signal detection in noise. The objective of this study was to elucidate the role of the MOC system in speech perception in noise. In normal-hearing human listeners, we examined (1) the association between magnitude of MOC inhibition and speech-in-noise performance, and (2) the association between MOC inhibition and the amount of contralateral acoustic stimulation (CAS)-induced shift in speech-in-noise acuity. MOC reflex measurements in this study considered critical measurement issues overlooked in past work by: recording relatively low-level, linear click-evoked otoacoustic emissions (CEOAEs), adopting 6 dB signal-to-noise ratio (SNR) criteria, and computing normalized CEOAE differences. We found normalized index to be a stable measure of MOC inhibition (mean = 17.21%). MOC inhibition was not related to speech-in-noise performance measured without CAS. However, CAS in a speech-in-noise task caused an SNRSP enhancement (mean = 2.45 dB), and this improvement in speech-in-noise acuity was directly related to their MOC reflex assayed by CEOAEs. Individuals do not necessarily use the available MOC-unmasking characteristic while listening to speech in noise, or do not utilize unmasking to the extent that can be shown by artificial MOC activation. It may be the case that the MOC is not actually used under natural listening conditions and the higher auditory centers recruit MOC-mediated mechanisms only in specific listening conditions-those conditions remain to be investigated.Srikanta K MishraMark E LutmanPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 1, p e85756 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Srikanta K Mishra Mark E Lutman Top-down influences of the medial olivocochlear efferent system in speech perception in noise.
description	One of the putative functions of the medial olivocochlear (MOC) system is to enhance signal detection in noise. The objective of this study was to elucidate the role of the MOC system in speech perception in noise. In normal-hearing human listeners, we examined (1) the association between magnitude of MOC inhibition and speech-in-noise performance, and (2) the association between MOC inhibition and the amount of contralateral acoustic stimulation (CAS)-induced shift in speech-in-noise acuity. MOC reflex measurements in this study considered critical measurement issues overlooked in past work by: recording relatively low-level, linear click-evoked otoacoustic emissions (CEOAEs), adopting 6 dB signal-to-noise ratio (SNR) criteria, and computing normalized CEOAE differences. We found normalized index to be a stable measure of MOC inhibition (mean = 17.21%). MOC inhibition was not related to speech-in-noise performance measured without CAS. However, CAS in a speech-in-noise task caused an SNRSP enhancement (mean = 2.45 dB), and this improvement in speech-in-noise acuity was directly related to their MOC reflex assayed by CEOAEs. Individuals do not necessarily use the available MOC-unmasking characteristic while listening to speech in noise, or do not utilize unmasking to the extent that can be shown by artificial MOC activation. It may be the case that the MOC is not actually used under natural listening conditions and the higher auditory centers recruit MOC-mediated mechanisms only in specific listening conditions-those conditions remain to be investigated.
format	article
author	Srikanta K Mishra Mark E Lutman
author_facet	Srikanta K Mishra Mark E Lutman
author_sort	Srikanta K Mishra
title	Top-down influences of the medial olivocochlear efferent system in speech perception in noise.
title_short	Top-down influences of the medial olivocochlear efferent system in speech perception in noise.
title_full	Top-down influences of the medial olivocochlear efferent system in speech perception in noise.
title_fullStr	Top-down influences of the medial olivocochlear efferent system in speech perception in noise.
title_full_unstemmed	Top-down influences of the medial olivocochlear efferent system in speech perception in noise.
title_sort	top-down influences of the medial olivocochlear efferent system in speech perception in noise.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/fccfa7d26c504c739785ff6ae08f309f
work_keys_str_mv	AT srikantakmishra topdowninfluencesofthemedialolivocochlearefferentsysteminspeechperceptioninnoise AT markelutman topdowninfluencesofthemedialolivocochlearefferentsysteminspeechperceptioninnoise
_version_	1718421599450824704

Top-down influences of the medial olivocochlear efferent system in speech perception in noise.

Ejemplares similares