Studies on the Corpus Callosum

On the basis of the concept of a unilateral cerebral dominance in man, Liepmann¹postulated that in right-handed persons the left hemisphere, by means of the corpus callosum, exercises a dominating influence on the right hemisphere. Liepmann and Maas²concluded that involvement of the anterior portion of the corpus callosum produced "sympathetic" dyspraxia in the subordinate hand. According to Lange,³apraxia or dyspraxia occurs most consistently after lesions of the corpus callosum or the gyrus supramarginalis of the dominant hemisphere. The studies of Baldy⁴and Critchley⁵on the syndrome of the anterior cerebral artery tend to substantiate the importance of the corpus callosum in the performance of purposeful and complex movements in the subordinate hand. Other investigators, such as Dandy,⁶Foerster,⁷Armitage and Meagher⁸and Barré and associates,⁹described cases of surgical section of the corpus callosum or destruction of this