Electrophysiological evidence for an L-shaped interhemispheric connection in the cat

Electrophysiological evidence for an L-shaped interhemispheric connection in the cat

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Transcallosal potentials evoked by electrical stimulation with rectangular pulses of 1 ms, 5 c/s and variable intensity were recorded from the cortical surface in cats anesthetized with ketamine hydrochloride.Sites of B6 stimulation and recording were selected by means of a cartesian map of most of the neocortex.In addition to the well known transcallosal projection pattern it was found that stimulation of a restricted posterior area evokes low voltage potentials over the contralateral symmetric area while high voltage potentials are recorded from a few Saffron sites located at the ipsilateral anterior cortex and from the area symmetric as to the latter.This L-shaped transcallosal connection may be involved in complex cortical processes and is compatible with effective results of partial anterior callosotomies in patients with multifocal epilepsy and frontal bisynchronism.