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J Neurophysiol 82: 484-488, 1999;
0022-3077/99 $5.00
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The Journal of Neurophysiology Vol. 82 No. 1 July 1999, pp. 484-488
Copyright ©1999 by the American Physiological Society

RAPID COMMUNICATION

Movement-Related Cerebellar Activation in the Absence of Sensory Input

Robert A. Weeks,1 Christian Gerloff,1 Manabu Honda,1 Marinos C. Dalakas,2 and Mark Hallett1

 1Human Motor Control Section and  2Neuromuscular Diseases Section, Medical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892-1428

Weeks, Robert A., Christian Gerloff, Manabu Honda, Marinos C. Dalakas, and Mark Hallett. Movement-Related Cerebellar Activation in the Absence of Sensory Input. J. Neurophysiol. 82: 484-488, 1999.Movement-related cerebellar activation may be due to sensory or motor processing. Ordinarily, sensory and motor processing are obligatorily linked, but in patients who have severe pansensory neuropathies with normal muscle strength, motor activity occurs in isolation. In the present study, positron emission tomography and functional magnetic resonance imaging in such patients showed no cerebellar activation with passive movement, whereas there was prominent movement-related cerebellar activation despite absence of proprioceptive or visual input. The results indicate that motor processing occurs within the cerebellum and do not support the recently advanced view that the cerebellum is primarily a sensory organ.




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