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The Journal of Neurophysiology Vol. 82 No. 6 December 1999, pp. 3488-3505
Copyright ©1999 by the American Physiological Society
1Departments of Neurology, 2Neurobiology and Anatomy, 3Brain and Cognitive Science, 4Physical Medicine and Rehabilitation, 5The Center for Visual Science, and 6The Brain Injury Rehabilitation Program at St. Mary's Hospital, University of Rochester School of Medicine and Dentistry, Rochester, New York, 14642
Poliakov, Andrew V. and
Marc H. Schieber.
Limited Functional Grouping of Neurons in the Motor Cortex Hand
Area During Individuated Finger Movements: A Cluster Analysis. J. Neurophysiol. 82: 3488-3505, 1999. Primary motor cortex (M1) hand area neurons show patterns of
discharge across a set of individuated finger and wrist movements so
diverse as to preclude classifying the neurons into functional groups
on the basis of simple inspection. We therefore applied methods of
cluster analysis to search M1 neuronal populations for groups of
neurons with similar patterns of discharge across the set of movements.
Populations from each of three monkeys showed a large group of neurons
the discharge of which increased for many or all of the movements and a
second small group the discharge of which decreased for many or all
movements. Two to three other small groups of neurons that discharged
more specifically for one or two movements also were found in each
monkey, but these groups were less consistent than the groups with
broad movement fields. The limited functional grouping of M1 hand area
neurons suggests that M1 neurons act as a network of highly diverse
elements in controlling individuated finger movements.
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