STUDIES ON THE CORPUS CALLOSUM

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Abstract
The importance of unilateral cerebral dominance in the mechanism of speech has become accepted. However, the role of cerebral dominance in the elaboration of visual perceptions remains in dispute. The present study is an attempt to elucidate this problem. In 6 cases of epilepsy the corpus callosum was completely sectioned by Dr. William P. Van Wagenen (Van Wagenen and Herren1). By this surgical procedure the "subordinate" hemisphere (usually the right), subserving the "subordinate" homonymous field (usually the left), is severed of its connections through the splenium with the dominant hemisphere, which subserves the dominant homonymous visual field. If a unilateral cerebral dominance exists for the mechanism of the higher forms of visual perception one would expect a disturbance of this mechanism in the "subordinate" homonymous visual field. On the basis of this assumption the higher visual functions were tested in each homonymous field before and after complete section of

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