RESPONSES FOLLOWING ELECTRICAL STIMULATION OF THE CEREBELLAR CORTEX IN THE NORMAL CAT

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Abstract
By means of electrodes which were permanently implanted in the bone of the skull, the cerebellum was stimulated in a series of 78 cats, which were otherwise normal and unrestrained. The same response could be obtained from the same electrode from day to day in the same cat, and the larger subdivisions of the cerebellum responded to stimulation similarly in different cats. The typical response to electrical stimulation consisted of movements appearing in 3 phases the 1st, occurring with the stimulus and involving mainly the head and trunk muscles; succeeded by the 2d phase, which came on as a rebound and was opposite in character to the 1st; the 3d, appearing as a series of slow movements gradually involving the head, body, limbs, and tail in a definite sequence and lasting for several mins. The long after effect (3d phase) did not always appear following stimulation and was more easily inhibited than the phases of stimulus and rebound (1st and 2d phases). During such attacks the cat''s normal behavior was interfered with to some extent, but the cat did not lose consciousness and often purred throughout an attack. The movements produced were slow, resembling "slow motion" pictures, and so were different from epileptic attacks elicitable by stimulation of the cerebral cortex. Anaesthesia prevented the appearance of these responses from the cerebellum.

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