[Interaction of callosal and extracallosal systems].

Studies of the topography of homotopic transcommissural evoked potentials in 85 symmetrical points of the cat motor cortex, prior to and after section of the corpus callosum, revealed the functional areas as follows: acommissural (53% of the total area), purely callosal (23%), mixed (22%), and purely extracallosal (2%). The summation and reciprocal interrelationships between the callosal and extracion flows spreading over the extracallosal system.