Sulcal/gyral pattern morphology of the perisylvian language region in developmental dyslexia

Two systems for classification of morphology of the perisylvian cortical ar ea have been suggested, that of Steinmetz ct al. (1990) and that of Witelso n and Kigar (1992). This study examines whether the variations in placement of these convolutions in the language cortex are related to diagnosis of d yslexia in a clinic-referred sample of 55 children ages 8 to 12 years. Addi tionally, the systems are compared to determine their relationship to neuro linguistic performance. In this study, the Steinmetz ct nl. (1990) system c aptured morphology al distinctions which were relevant to performance on ne urolinguistic measures, while Witelson and Kigar's (1992) system did not. U nder neither system was morphology associated with diagnosis of dyslexia. ( C) 2000 Academic Press.