Independent control of the digits: changes in perceived heaviness over a wide range of force.

Exp Brain Res

Department of Clinical Neurophysiology, Prince Henry Hospital, Sydney, Australia.

Published: February 1993

Perceived heaviness of a weight lifted by flexion of the distal joint of one digit increases when an adjacent digit concurrently lifts a weight. The present study confirmed this finding for relatively low weights (representing 3-5% maximal voluntary force) and a method was adapted to show that this effect occurs for much larger weights (20-25% maximal force). Thus, the increase in perceived heaviness is likely to operate over a wide range of muscle force generated by the hand. As perceived heaviness is biased by the magnitude of the central motor commands, these findings may reflect a lack of complete independence of motor commands to the long flexor muscles acting on the digits.

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http://dx.doi.org/10.1007/BF00227850DOI Listing

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