INTERHEMISPHERIC RESPONSES IN THE OPOSSUM

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Abstract
The interhemispheric response in the opossum, an animal with a natural absence of the corpus callosum, was investigated by stimulation of the neocortical surface of the opposite hemisphere. The following components of the averaged interhermispheric response were recorded from the area homologous with the site of contralateral stimulation:1. a primary response with a peak latency of 8 to 15 msec., which was abolished by section of the anterior commissure; 2. a secondary response with a peak latency of 60 to 80 msec., which survived section of the anterior and hippocampal commissures and midbrain; 3. a rhythmic after discharge, which appeared as a series of waves of 4-6 cycles/sec, with decreasing amplitude lasting 1.5 seconds, and which survived section of the anterior and hippocampal commissures and midbrain.