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Frontiers Media, Frontiers in Human Neuroscience, (7)

DOI: 10.3389/fnhum.2013.00454

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Impaired auditory sampling in dyslexia: further evidence from combined fMRI and EEG

Journal article published in 2013 by Katia eLehongre, Benjamin eMorillon, Katia Lehongre, Anne-Lise eGiraud, Franck eRamus, Benjamin Morillon ORCID, Anne-Lise Giraud, Franck Ramus ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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.