Key points are not available for this paper at this time.
I N A SERIES Of papers on the corpus callosum 2,5,6,1~ evidence has been presented that commissural systems other than the corpus callosum probably play a large rSle in activities that require the coordination of the two hemispheres. In such unilateral activities as writing with the subordinate hand, the recognition of written symbols and wooden letters in the subordinate side 5 and possibly also of letters in the subordinate homonymous field 2,5 after complete section of the corpus callosum points strongly to the presence of subcallosal commissural systems between the dominant and subordinate hemispheres. The anterior commissure is, next to the corpus callosum, apparently, the most important interhemispheral commissural system. The present paper is concerned with a detailed study of the higher integrative activities of two patients, one with section of the anterior commissure one year after complete section of the corpus callosum, and the other with simultaneous section of the anterior commissure and the anterior half of the corpus callosum. The essential problem consists of an evaluation of the r51e of the anterior commissure in interhemispheral connection after partial or complete section of the corpus callosum.
Andrew J. Akelaitis (Wed,) studied this question.