The effects of transcallosal surgery on interhemispheric transfer of i
nformation were investigated in five patients who underwent partial se
ction of the corpus callosum for evacuation of a brain tumor. In compa
rison with normal controls, postoperative findings indicated subtle mo
tor and/or sensory manifestations of hemispheric disconnection which t
ended to resolve overtime. However, in no case were the disconnection
effects disabling in the performance of daily activities.