NPB 112, Winter 2011: 2/15/11I.Cerebellum (Ch. 19)II.Basal ganglia (Ch. 18)Functions of Cerebellum1. Maintains equilibrium and stance.2. Correct ongoing movements. 3.Initiation of movement4. Learns and stores motor programs. 5. Timing function (like a clock)?6. Cognition? (e.g., language processing)
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Deficits due to cerebellar damageTurkish handwalkers: cerebellar defect compensated for by walking with aid of hands. 1. Vestibulocerebellum: ataxiaa. loss of equilibrium, wide stanceb. "drunken sailor's gait”2. Spinocerebellum: loss of fine coordination.a. Decomposition of movementb. Can’t correct ongoing movement.(1) over- or undershoot of target (dysmetria)(2) timing deficit (disdiochokinesia)(3) Slurred speech (dysarthria)3. Lateral cerebellum: a. Loss of learned motor skills (e.g., playing instrument)b. delay in initiating movementsFig. 19.1 (A)