Abstract

The data obtained in experiments with dogs show that the stimulation of the head of the caudate nucleus has inhibitory effects on electromyogram components, latency, pattern and amplitude of the instrumental defensive reaction. The changes become more pronounced with the increase in the intensity of electrical stimulation. The early electromyogram components connected with the posture change before the instrumental movement have undergone the most significant alterations; the avoidance of electrical stimulation which is the end result of the instrumental reaction was just slightly altered. It is suggested that the head of the caudate nucleus controls the realization of a motor behavioural task that is important in the given situation.

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