Abstract

Anatomical asymmetries of the brain have been established for several structures. In right-handed people the sylvian fissure curves up sharply on the right side and continues horizontally on the left. The planum temporale is larger on the left side and recently it has been shown that the width of the right hemisphere is larger in the frontal region and smaller in the occipital region. It is assumed that these asymmetries represent the usual dominance for symbolic speech function. In developmental dyslexia an abnormal symmetry of the above mentioned structures has been demonstrated in some reports. However, very often dyslexia is not an isolated disorder, but it is part of a more generalized speech and language disorder: developmental dysphasia

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