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Effects of changes in mechanical state of limb on cerebellar intention tremor

Effects of changes in mechanical state of limb on cerebellar intention tremor T. VILIS &mrtmcn J-. I-IORE Uniwrsity of’ Western Ontario, London, Ontario, Cunada N6A 5 CI t c/J’Physiology, SUMMARY CONCLUSIONS 1. An animal model for the study of cerebellar intention was produced by implanting cryoprobe sheaths alongside the dentate interpositus nuclei of the cerebellum in three Cc>bris monkeys. These monkeys were trained to make fast flexion extension elbow movements by moving a hle in a horizontal arc to resist perturbations applied to the hle as it was held within target regions. 2. Cooling through both sheaths simultaneously (to 10°C sheath reference temperature) resulted in a 3- to ~-HZ in the ipsilateral forelimb, which was especially evident during rapid movements following perturbations applied to the hle. 3. The character of the was altered by mechanical loads applied to the limb: the frequency was increased by addition of spring stiffness by an increase in constant torque decreased by addition of mass. The amplitude of the was decreased by an increase in viscous resistance. In addition, romly timed perturbations applied to the forearm resynchronized the phase of the . 4. The frequency of the was also dependent on the position of the forelimb, being higher in flexion than in extension. 5. During http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurophysiology The American Physiological Society

Effects of changes in mechanical state of limb on cerebellar intention tremor

Journal of Neurophysiology , Volume 40: 1214 – Sep 1, 1977

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Publisher
The American Physiological Society
Copyright
Copyright © 1977 the American Physiological Society
ISSN
0022-3077
eISSN
1522-1598
Publisher site
See Article on Publisher Site

Abstract

T. VILIS &mrtmcn J-. I-IORE Uniwrsity of’ Western Ontario, London, Ontario, Cunada N6A 5 CI t c/J’Physiology, SUMMARY CONCLUSIONS 1. An animal model for the study of cerebellar intention was produced by implanting cryoprobe sheaths alongside the dentate interpositus nuclei of the cerebellum in three Cc>bris monkeys. These monkeys were trained to make fast flexion extension elbow movements by moving a hle in a horizontal arc to resist perturbations applied to the hle as it was held within target regions. 2. Cooling through both sheaths simultaneously (to 10°C sheath reference temperature) resulted in a 3- to ~-HZ in the ipsilateral forelimb, which was especially evident during rapid movements following perturbations applied to the hle. 3. The character of the was altered by mechanical loads applied to the limb: the frequency was increased by addition of spring stiffness by an increase in constant torque decreased by addition of mass. The amplitude of the was decreased by an increase in viscous resistance. In addition, romly timed perturbations applied to the forearm resynchronized the phase of the . 4. The frequency of the was also dependent on the position of the forelimb, being higher in flexion than in extension. 5. During

Journal

Journal of NeurophysiologyThe American Physiological Society

Published: Sep 1, 1977

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