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Science 31 May 1991:
Vol. 252. no. 5010, pp. 1313 - 1315
DOI: 10.1126/science.1925545
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Articles

Science, Vol 252, Issue 5010, 1313-1315
Copyright © 1991 by American Association for the Advancement of Science

articles

Two- rather than three-dimensional representation of saccades in monkey superior colliculus

AJ van Opstal, K Hepp, BJ Hess, D Straumann, and V Henn

Neurology Department, University Hospital, Zurich, Switzerland.

Saccades are controlled by neurons in the brainstem reticular formation that receive input from the superior colliculus and cortex. Recently two quantitative models have been proposed for the role of the colliculus in the generation of three-dimensional eye movements. In order to test these models, three-dimensional eye movements were measured in the alert monkey to investigate whether the saccadic motor map of the superior colliculus is two-dimensional, representing retinal target vectors, or three-dimensional, representing three-dimensional motor error for the rotation of the eye. Electrical stimulation of the superior colliculus produced two-dimensional, not three-dimensional, eye movements. It is therefore concluded that the collicular motor map is two-dimensional.


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