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Judgment and control of velocity in rapid voluntary movements

✍ Scribed by T. E. Milner

Publisher
Springer-Verlag
Year
1986
Tongue
English
Weight
908 KB
Volume
62
Category
Article
ISSN
0014-4819

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✦ Synopsis

Control of velocity in rapid flexion movements of the interphalangeal joint of the thumb was investigated by examining movement trajectories and patterns of activity in the extensor pollicis longus (EPL) and flexor pollicis longus (FPL) muscles. Although velocity was controlled with considerable accuracy, it was not sensed with the same precision. Consistent errors were made when subjects attempted to match the peak velocities under conditions in which the relationship between muscle activity and joint acceleration had been altered, i.e. changing the angle from which movement was initiated or varying the load. Rather than relying on afferent feedback from peripheral sensory receptors for information about velocity during rapid movements, it is suggested that subjects were more likely to base their judgment of velocity on sensations evoked by the voluntary motor command.

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