Impaired auditory sampling in dyslexia: further evidence from combined fMRI and EEGReportar como inadecuado

Impaired auditory sampling in dyslexia: further evidence from combined fMRI and EEG - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 ICM - Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute 2 Department of Psychiatry 3 UNIGE - Université de Genève 4 LSCP - Laboratoire de sciences cognitives et psycholinguistique

Abstract : The aim of the present study was to explore auditory cortical oscillation properties in developmental dyslexia. We recorded cortical activity in 17 dyslexic participants and 15 matched controls using simultaneous EEG and fMRI during passive viewing of an audiovisual movie. We compared the distribution of brain oscillations in the delta, theta and gamma ranges over left and right auditory cortices. In controls, our results are consistent with the hypothesis that there is a dominance of gamma oscillations in the left hemisphere and a dominance of delta-theta oscillations in the right hemisphere. In dyslexics, we did not find such an interaction, but similar oscillations in both hemispheres. Thus, our results confirm that the primary cortical disruption in dyslexia lies in a lack of hemispheric specialization for gamma oscillations, which might disrupt the representation of or the access to phonemic units.

Keywords : auditory sampling delta oscillation EEG-fMRI theta oscillation phonemic processing gamma oscillation dyslexia

Autor: Katia Lehongre - Benjamin Morillon - Anne-Lise Giraud - Franck Ramus -



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