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The Journal of Neurophysiology Vol. 81 No. 4 April 1999, pp. 1960-1965
Copyright ©1999 by the American Physiological Society
RAPID COMMUNICATION
1 Department of Physiology, SUNY, Buffalo, New York 14214; and 2 Department of Anatomy, University College London, London WC1E 6BT, United Kingdom
Baizer, Joan S.,
Ines Kralj-Hans, and
Mitchell Glickstein.
Cerebellar lesions and prism adaptation in Macaque monkeys. If
a laterally displacing prism is placed in front of one eye of a person
or monkey with the other eye occluded, they initially will point to one
side of a target that is located directly in front of them. Normally,
people and monkeys adapt easily to the displaced vision and correct
their aim after a few trials. If the prism then is removed, there is a
postadaptation shift in which the subject misses the target and points
in the opposite direction for a few trials. We tested five Macaque
monkeys for their ability to adapt to a laterally displacing prism and
to show the expected postadaptation shift. When tested as normals, all
five animals showed the typical pattern of adaptation and postadaptation shift. Like human subjects, the monkeys also showed complete interocular transfer of the adaptation but no transfer of the
adaptation between the two arms. When preoperative training and testing
was complete, we made lesions of various target areas on the cerebellar
cortex. A cerebellar lesion that included the dorsal paraflocculus and
uvula abolished completely the normal prism adaptation for the arm
ipsilateral to the lesion in one of the five monkeys. The other four
animals retained the ability to prism-adapt normally and showed the
expected postadaptation shift. In the one case in which the lesion
abolished prism adaptation, the damage included Crus I and II,
paramedian lobule and the dorsal paraflocculus of the cerebellar
hemispheres as well as lobule IX, of the vermis. Thus in this case, the
lesion included virtually all the cerebellar cortex that receives
mossy-fiber visual information relayed via the pontine nuclei from the
cerebral cortex. The other four animals had damage to lobule V, the
classical anterior lobe arm area and/or vermian lobules VI/VII, the
oculomotor region. When tested postoperatively, some of these animals
showed a degree of ataxia equivalent to that of the case in which prism
adaptation was affected, but prism adaptation and the postadaptation
shift remained normal. We conclude that in addition to its role in
long-term motor learning and reflex adaptation, the region of the
cerebellum that was ablated also may be a critical site for a
short-term motor memory. Prism adaptation seems to involve a region of
the cerebellum that receives a mossy-fiber visual error signal and probably a corollary discharge of the movement.
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