INFLUENCE OF STIMULATION OF MEDIAL HYPOTH ALAMUS ON THE INTERACTION OF RABBITS NEOCORTICAL NEURONS

By means of histogams of cross- and autocorrelation plotting the inter action of visual and sensorimotor neocortex neurons was studied before and after stimulation of some medial hypothalamic nucleous, The stimu lation was provided by packages of bipolar impulses with frequency of 100 Hz and current value of 50-200 mcA from the bipolaric electrodes a nd resulted in appearance of avoidance reactions to: stimulation place at rabbits' free behavior. After stimulation as compared with calm wa kefulness the number of pairs of neurons with correlated activity was increased by 45%, the discharges of sensorimotar neurons forestalled t he discharges of the visual ones for up to 120 ms, the frequency of pe riodicity of correlated discharges was basically in the theta-range. B y means of comparison the interaction of neurons after stimulation of medial hypothalamus and midbrain reticular formation and in intersigna l interval during defensive conditioning the conclusion was made about manifestation of defensive motivation in definite indices of cortical neurons interaction during tonic conditioned reflex.