[Analysis of an instrumental defense response on dogs following stimulation of the head of the caudate nucleus].

In chronic experiments on dogs taught to instrumental avoiding of electrical shock, changes in organization and regulation of movements on electrical stimulation of head of the caudate nucleus via implanted electrodes, were studied. The preliminary low-frequency stimulation increased the latency, altered the posture readjustment, EMGs, and mechanograms of movements. Markedness of the changes depended on the strength of stimulating current. The high-frequency (50 Hz) stimulation either does not affect the response or completely inhibits it. Stimulation against the background of avoiding movements caused its caudal cessation. The quantitative analysis of the movement parameters showed the cessation to be not adequate to analogous cessation of movement under ordinary conditions of cessation of the conditioned stimulus. The data obtained suggest an effect of head of the caudate nucleus on the processes of programming, organization, and regulation of movement.