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Science 15 March 1991:
Vol. 251. no. 4999, pp. 1358 - 1360
DOI: 10.1126/science.2003221
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Articles

Science, Vol 251, Issue 4999, 1358-1360
Copyright © 1991 by American Association for the Advancement of Science

articles

Movement of neural activity on the superior colliculus motor map during gaze shifts

DP Munoz, D Pelisson, and D Guitton

Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada.

The superior colliculus contains neurons that cause displacements of the visual axis (gaze shifts). These cells are arranged topographically in a motor map on which the vector (amplitude and direction) of the coded movement varies continuously with location. How this spatial representation becomes a temporal code (frequency and duration) in the motoneurons is unknown. During a gaze shift, a zone of neural activity moved continuously on the map from an initial location, defining the vector of the desired gaze shift, to a final "zero" position containing neurons that were active during fixation. Thus, the spatial-temporal transformation may be accomplished by control of gaze throughout the spatial trajectory of activity on the motor map.


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