[Electrophysiologic study of the connections of the 2d somatosensory area of the cortex with the neo-, paleocortical and striate formations of the brain]. / Elektrofiziologicheskoe issledovanie sviazei vtoroi somatosensornoi oblasti kory s neo-, paleokortikal'nymi i striarnymi obrazovaniiami mozga

2nd somatosensory area (C2) was shown to have modulating influence on evoked activity of the 1st somatosensory and visual areas. Electrical stimulation of C2 evoked short latency potentials in the structures of paleocortex (hippocampus) and striatum (putamen, caudate nucleus). Analysis of the data obtained here and elsewhere (19) suggests the important role of C2 in mechanisms of selection, comparison and integration of adequate sensory information under conditions of uncertainty, for the programming of behaviour.

[Comparative assessment of the role of the primary and secondary somatosensory regions of the cerebral cortex during conditioned reflex behavior in animals]. / Sravnitel'naia otsenka roli pervoi i vtoroi somatosensornykh oblastei kory bol'shikh polusharii v uslovnoreflektornom povedenii zhivotnykh

The first (SI) and second (SII) somatosensory cortical areas were ablated in one group of cats after preliminary learning of tactile differentiation of rough and smooth surfaces of the floor coating in a special chamber. Somatosensory areas were ablated in another group after learning an adequate choice of the reinforcement side in response to a bell and a metronome. Unilateral and bilateral ablation of SI affected but little the elaboration and achievement of the above acts. Unilateral and bilateral ablation of area SII resulted in a sharp impairment of the tactile differentiation of the surfaces (35% correct responses after unilateral and 26% after bilateral ablation) and a less pronounced disturbances in the choice of the side of reinforcement in response to the bell and the metronome (80% of correct choice after unilateral and 72% after a bilateral ablation.