Bilateral differences in brain potentials from the two cerebral hemispheres in relation to laterality and stuttering.

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Abstract
Brain potentials were recorded simultaneously from bilateral occipital regions in 48 righthanded, 8 lefthanded and 9 ambidextrous children, and from bilateral occipital and motor speech areas in two adult stutterers. The records were studied with respect to the phase relationship of the a waves in the two hemispheres and the amount of unilateral blocking of [alpha] waves that occurred. The incidence of asynchronism of [alpha] waves in the 2 hemispheres is significantly less in the righthanded group than in either of the other 2 groups; the ambidextrous group shows the greatest amt. of asynchronism. Unilateral blocking is also less in the righthanded group. In the stutterers it was shown that asynchronism of [alpha] waves in the 2 hemispheres and unilateral blocking are associated with and precede stuttering episodes.

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