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On the hand transport component of prehensile movements.

Authors
  • Haggard, P
  • Wing, A
Type
Published Article
Journal
Journal of motor behavior
Publication Date
Sep 01, 1997
Volume
29
Issue
3
Pages
282–287
Identifiers
PMID: 12453786
Source
Medline
License
Unknown

Abstract

Jeannerod (1981) proposed that prehensile movements involve two independent visuomotor channels that are responsible for hand transport and hand aperture. In many studies, the movement of a marker placed on the wrist has been used as an index of hand transport because wrist movement is unaffected by the movements of the digits responsible for hand aperture. In the present study, the spatial paths of the wrist, index finger, and thumb of 5 adults, each performing 50 reaching movements, were measured with a WATSMART movement tracking system, and their variability was analyzed. The measures of movement variability suggest that the motor system is more concerned with thumb position than with wrist position during hand transport. Although the wrist is a technically convenient index of hand transport, the thumb may be a more appropriate index from the point of view of motor control

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