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The Journal of Neurophysiology Vol. 87 No. 2 February 2002, pp. 1149-1154
Copyright ©2002 by the American Physiological Society
RAPID COMMUNICATION
Centre de Recherche en Sciences Neurologiques, Département de Physiologie, Université de Montréal, Montreal, Quebec H3C 3J7, Canada
Cisek, Paul and
John F. Kalaska.
Simultaneous Encoding of Multiple Potential Reach Directions in
Dorsal Premotor Cortex. J. Neurophysiol. 87: 1149-1154, 2002. We present evidence that the primate brain can
simultaneously generate discrete directional signals related to
multiple alternative reaching actions before making a decision between
them. A monkey performed a task in which the correct target for a
reaching movement was specified during two consecutive instructed-delay
periods. First, two potential targets were presented; and second, a
nonspatial cue identified one of them as the correct movement target.
During the first period, two directional signals coexisted in the
activity of cells in dorsal premotor cortex (PMd), oriented toward the two potential targets. During the second period, one of these disappeared and the remaining signal predicted the monkey's response choice. These results suggest that, when faced with multiple salient opportunities for reaching, the primate brain performs sensorimotor transformations in parallel to begin planning several reaching movements simultaneously before selecting one for overt execution.
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