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Science 15 September 1989:
Vol. 245. no. 4923, pp. 1209 - 1210
DOI: 10.1126/science.2675307
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Articles

Science, Vol 245, Issue 4923, 1209-1210
Copyright © 1989 by American Association for the Advancement of Science

articles

Visuomotor coordination in reaching and locomotion

AP Georgopoulos and S Grillner

Philip Bard Laboratories for Neurophysiology, Department of Neuroscience, Johns Hopkins University, School of Medicine, Baltimore, MD 21205.

Locomotion and reaching have traditionally been regarded as separate motor activities. In fact, they may be closely connected both from an evolutionary and a neurophysiological viewpoint. Reaching seems to have evolved from the neural systems responsible for the active and precise positioning of the limb during locomotion; moreover, it seems to be organized in the spinal cord. The motor cortex and its corticospinal outflow are preferentially engaged when precise positioning of the limb is needed during locomotion and are also involved during reaching and active positioning of the hand near objects of interest. All of these motor activities require visuomotor coordination, and it is this coordination that could be achieved by the motor cortex and interconnected parietal and cerebellar areas.


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