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Science 20 March 1992:
Vol. 255. no. 5051, pp. 1517 - 1523
DOI: 10.1126/science.1549781
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Articles

Science, Vol 255, Issue 5051, 1517-1523
Copyright © 1992 by American Association for the Advancement of Science

articles

Cerebral cortical mechanisms of reaching movements

JF Kalaska and DJ Crammond

Departement de Physiologie, Faculte de Medecine, Universite de Montreal, Quebec, Canada.

Because reaching movements have a clear objective--to bring the hand to the spatial location of an object--they are well suited to study how the central nervous system plans a purposeful act from sensory input to motor output. Most models of movement planning propose a serial hierarchy of analytic steps. However, the central nervous system is organized into densely interconnected populations of neurons. This paradox between the apparent serial order of central nervous system function and its complex internal organization is strikingly demonstrated by recent behavioral, modeling, and neurophysiological studies of reaching movements.


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Motor Cortical Representation of Speed and Direction During Reaching.
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PET Study of Pointing With Visual Feedback of Moving Hands.
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