Dyslexia is most often atributed to phonological impairments, manifested in abnormal activation of the left temporal and temporoparietal cortex in response to auditorily presented language and possibly associated with anomalies in the cytoarchitecture and hemispheric symmetry of the plana temporale. The immediate cortical correlate of the severely impaired reading process has, however, remained obscure. Here we report on the distinct time courses of cortical activation in dyslexic and control subjects during passive viewing of single words, tracked with whole‐head magnetoencephalography. A striking difference was found in the left inferior temporo‐occipital region where intracranial recordings have recently identified word‐specific responses within 200 msec after stimulus onset: controls showed a sharp activation at about 180 msec after word presentation, whereas dyslexics failed to activate this area entirely, or showed a slowly increasing late response. Pereception of words as specific units thus seems to be imparied in dyslexics.
Annals of Neurology – Wiley
Published: Aug 1, 1996
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