Articlegold2013

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

Katia Lehongre · Benjamin Morillon · Anne‐Lise Giraud · Franck Ramus

113 citations0/0 files storedFrontiers in Human Neuroscience

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Reading and Literacy Development Neurobiology of Language and Bilingualism Neural dynamics and brain function

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.

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References

1987The nature of phonological processing and its causal role in the acquisition of reading skills.2004Specific reading disability (dyslexia): what have we learned in the past four decades?1980Auditory temporal perception, phonics, and reading disabilities in children 1985Developmental dyslexia: Four consecutive patients with cortical anomalies 2006From single to multiple deficit models of developmental disorders 2010A temporal sampling framework for developmental dyslexia 2007What Phonological Deficit?1997Speech Perception Deficits in Poor Readers: Auditory Processing or Phonological Coding?

Cited by

2015Developmental evaluation of atypical auditory sampling in dyslexia: Functional and structural evidence 2020Selective enhancement of low-gamma activity by tACS improves phonemic processing and reading accuracy in dyslexia 2016Possible roles for fronto-striatal circuits in reading disorder 2016Atypical right hemisphere response to slow temporal modulations in children with developmental dyslexia 2014Impaired extraction of speech rhythm from temporal modulation patterns in speech in developmental dyslexia

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