The effect of long-term unilateral deafness on the activation pattern in the auditory cortices of French-native speakers: influence of deafness side |
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Authors: | Julien Hanss Evelyne Veuillet Kamel Adjout Julien Besle Lionel Collet Hung Thai-Van |
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Institution: | 1. Université de Lyon, F-69003, Lyon, France 2. Université Lyon 1, F-69003, Lyon, France 3. CNRS, UMR 5020, Neurosciences sensorielles-comportement-cognition, F-69007, Lyon, France 4. Hospices Civils de Lyon, service d'audiologie et d'explorations orofaciales, h?pital Edouard Herriot, Lyon, F-69003, France 5. Institut Fédératif des Neurosciences de Lyon, F-69677, Lyon-Bron, France
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Abstract: | Background In normal-hearing subjects, monaural stimulation produces a normal pattern of asynchrony and asymmetry over the auditory cortices
in favour of the contralateral temporal lobe. While late onset unilateral deafness has been reported to change this pattern,
the exact influence of the side of deafness on central auditory plasticity still remains unclear. The present study aimed
at assessing whether left-sided and right-sided deafness had differential effects on the characteristics of neurophysiological
responses over auditory areas. Eighteen unilaterally deaf and 16 normal hearing right-handed subjects participated. All unilaterally
deaf subjects had post-lingual deafness. Long latency auditory evoked potentials (late-AEPs) were elicited by two types of
stimuli, non-speech (1 kHz tone-burst) and speech-sounds (voiceless syllable/pa/) delivered to the intact ear at 50 dB SL.
The latencies and amplitudes of the early exogenous components (N100 and P150) were measured using temporal scalp electrodes. |
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