MOTOR EFFECTS FROM ELECTRICAL STIMULATION OF BASAL CEREBELLUM IN UNRESTRAINED CAT

Abstract

The basal medial area of the cerebellum of unrestrained cats was stimulated electrically using Hess''s method. With low frequencies of stimulation (3-7pps), rhythmic movements of the head were the main effects. These movements consisted either of a rotation, a turning, or a lowering. Anatomical examination revealed that these effects are produced from well defined areas. Results indicate that in the cerebellar area examined the nervous elements are arranged according to a "three-dimensional" plan rather than according to body areas or single muscles. With higher frequencies more complex effects such as leaning of the back part of the body to the side, curving of the body, and inhibition were seen. The leaning and inhibitory effects were often followed by strong rebounds. From electrodes situated in the lingula or paralingular areas, with higher frequencies, wild biting or licking of the fore-and hindlegs and of the tail was produced, often accompanied by meowing and growling.