Electrophysiological differences and similarities in audiovisual speech processing in CI users with unilateral and bilateral hearing loss.

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State: Public
Version: Final published version
License: CC BY-NC-ND 4.0
Serval ID
serval:BIB_6A6ABD96A0D2
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Electrophysiological differences and similarities in audiovisual speech processing in CI users with unilateral and bilateral hearing loss.
Journal
Current research in neurobiology
Author(s)
Layer N., Weglage A., Müller V., Meister H., Lang-Roth R., Walger M., Murray M.M., Sandmann P.
ISSN
2665-945X (Electronic)
ISSN-L
2665-945X
Publication state
Published
Issued date
2022
Peer-reviewed
Oui
Volume
3
Pages
100059
Language
english
Notes
Publication types: Journal Article
Publication Status: epublish
Abstract
Hearing with a cochlear implant (CI) is limited compared to natural hearing. Although CI users may develop compensatory strategies, it is currently unknown whether these extend from auditory to visual functions, and whether compensatory strategies vary between different CI user groups. To better understand the experience-dependent contributions to multisensory plasticity in audiovisual speech perception, the current event-related potential (ERP) study presented syllables in auditory, visual, and audiovisual conditions to CI users with unilateral or bilateral hearing loss, as well as to normal-hearing (NH) controls. Behavioural results revealed shorter audiovisual response times compared to unisensory conditions for all groups. Multisensory integration was confirmed by electrical neuroimaging, including topographic and ERP source analysis, showing a visual modulation of the auditory-cortex response at N1 and P2 latency. However, CI users with bilateral hearing loss showed a distinct pattern of N1 topography, indicating a stronger visual impact on auditory speech processing compared to CI users with unilateral hearing loss and NH listeners. Furthermore, both CI user groups showed a delayed auditory-cortex activation and an additional recruitment of the visual cortex, and a better lip-reading ability compared to NH listeners. In sum, these results extend previous findings by showing distinct multisensory processes not only between NH listeners and CI users in general, but even between CI users with unilateral and bilateral hearing loss. However, the comparably enhanced lip-reading ability and visual-cortex activation in both CI user groups suggest that these visual improvements are evident regardless of the hearing status of the contralateral ear.
Keywords
Audiovisual speech perception, Bilateral hearing loss, Cochlear implant, Cortical plasticity, Event-related potential, Multisensory integration, Single-sided-deafness
Pubmed
Open Access
Yes
Funding(s)
Swiss National Science Foundation / Projects / 169206
Create date
28/11/2022 14:55
Last modification date
02/12/2022 7:11
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