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Disrupted Timing of Discontinuous But Not Continuous Movements by Cerebellar Lesions
Rebecca M. C. Spencer,1,2*
Howard N. Zelaznik,2
Jörn Diedrichsen,1
Richard B. Ivry1
Abstract:
Patients with cerebellar damage are known to exhibit deficitsin the temporal control of movements. We report that these deficitsare restricted to discontinuous movements. Cerebellar patientsexhibited no deficit in temporal variability when producingcontinuous, rhythmic movements. We hypothesize that the temporalproperties of continuous movements are emergent and reflectthe operation of other control parameters not associated withthe cerebellum. In contrast, discontinuous movements requirean explicit representation of the temporal goal, a functionof the cerebellum. The requirement for explicit temporal representationprovides a parsimonious account of cerebellar involvement ina range of tasks.
1 Department of Psychology, University of California, Berkeley, 3210 Tolman Hall #1650, Berkeley, CA 94720, USA. 2 Department of Health & Kinesiology, Integrative Program in Neuroscience, Purdue University, 1362 Lambert, West Lafayette, IN 47907, USA.
* To whom correspondence should be addressed. E-mail: rspencer{at}socrates.berkeley.edu
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