[Interregional transcallosal connections between the auditory and parietal cortex]

Abstract

Interregional transcallosal responses to the stimulation of auditory cortex occurred throughout the surface of parietal cortex in immobilized cats and were either positive-negative or negative-positive. The former EPs had a longer latency and a greater total amplitude of both components. The negative-positive EPs disappeared after section of the callosal body whereas the positive-negative EPs were but insignificantly altered. The potentials were characterized by a functional interhemisphere asymmetry. The right hemisphere dominated by the average amplitude of the negative phase of negative-positive responses. The amplitude of early positive component dominated over the right hemisphere in males and over the left one in females. Delayed negative wave was greater over the right hemisphere in both sexes. The delayed components of the EPs had a significantly shorter latency of the peak in the dominating hemisphere.