Absence of Disconnection Syndrome after Early Callosotomy

Ever since the seminal studies of Sperry, Gazzaniga and Bogen (e.g., Sperry et al. 1969) it is well established that epileptic adults with therapeutic section of the corpus callosum show interhemispheric disconnection deficits. Typically, these patients are unable to compare sensory information separately conveyed to different hemispheres. This applies particularly to the visual and tactile modalities that are based upon predominantly crossed pathways.