Disrupted timing of discontinuous but not continuous movements by cerebellar lesions.
Patients with cerebellar damage are known to exhibit deficits in the temporal control of movements. We report that these deficits are restricted to discontinuous movements. Cerebellar patients exhibited no deficit in temporal variability when producing continuous, rhythmic movements. We hypothesize that the temporal properties of continuous movements are emergent and reflect the operation of other control parameters not associated with the cerebellum. In contrast, discontinuous movements require an explicit representation of the temporal goal, a function of the cerebellum. The requirement for explicit temporal representation provides a parsimonious account of cerebellar involvement in a range of tasks.
Spencer
Rebecca M C
RM
Department of Psychology, University of California, Berkeley, 3210 Tolman Hall #1650, Berkeley, CA 94720, USA. rspencer@socrates.berkeley.edu
Zelaznik
Howard N
HN
Diedrichsen
Jörn
J
Ivry
Richard B
RB
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002526:Cerebellar Diseases / Q000503:physiopathology*; D002531:Cerebellum / Q000502:physiology / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D009068:Movement; D011597:Psychomotor Performance; D013132:Spinocerebellar Degenerations / Q000503:physiopathology*; D013997:Time Factors