Altered Low-Gamma Sampling in Auditory Cortex Accounts for the Three Main Facets of Dyslexia

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• 作者：Katia Lehongre¹ ; Franck Ramus² ; Nadè ; ge Villiermet² ; Denis Schwartz³ ; Anne-Lise Giraud¹ ; ^{anne-lise.giraud@ens.fr}
• 刊名：Neuron
• 出版年：2011
• 出版时间：22 December 2011
• 年：2011
• 卷：72
• 期：6
• 页码：1080-1090
• 全文大小：857 K

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Summary

It has recently been conjectured that dyslexia arises from abnormal auditory sampling. What sampling rate is altered and how it affects reading remains unclear. We hypothesized that by impairing phonemic parsing abnormal low-gamma sampling could yield phonemic representations of unusual format and disrupt phonological processing and verbal memory. Using magnetoencephalography and behavioral tests, we show in dyslexic subjects a reduced left-hemisphere bias for phonemic processing, reflected in less entrainment to ?0?Hz acoustic modulations in left auditory cortex. This deficit correlates with measures of phonological processing and rapid naming. We further observed enhanced cortical entrainment at rates beyond 40?Hz in dyslexics and show that this particularity is associated with a verbal memory deficit. These data suggest that a single auditory anomaly, i.e., phonemic oversampling in left auditory cortex, accounts for three main facets of the linguistic deficit in dyslexia.