[Interaction between symmetrical cortical dominants formed during simultaneous bilateral polarization].

Interhemispheric relations of symmetrical regions of the fields 18 and 17 in the cat's cortex were studied during bilateral simultaneous polarization of the parastriate cortex. The formation of two dominant sites was shown as well as their "fight", with subsequent retention of the left side alone and suppression of the right one. The interhemispheric relations between the dominant sites during their formation, were of a summation reciprocal type; the interhemispheric influences for the left-side dominant were of callosal nature, whereas for the right-side one they were extracallosal. The "fight" between two dominants resulted in first partial and then complete disturbance of the extracallosal mechanism, whereas the callosal one persisted. This dynamics of the dominants interaction was accompanied by extracallosal mutually depressing inhemispheric influences in the field 17. The obtained data show the role of the functional interhemispheric asymmetry of the surface cortical layers in the hemisphere dominance during interaction of the polarization dominants.