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Abstract A patient is reported who had a well‐documented history of developmental dyslexia. Reading difficulties were present in other male members of the immediate family. Gross anatomical and cytoarchitectonic analysis of the brain in serial sections showed a consistently wider left cerebral hemisphere, an area of polymicrogyria in the left temporal speech region, and mild cortical dysplasias in limbic, primary, and association cortices of the left hemisphere.
Galaburda et al. (Wed,) studied this question.