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Journal of Neuroscience, Vol 1, 710-720, Copyright © 1981 by Society for Neuroscience
Invariant characteristics of a pointing movement in man
JF Soechting and F Lacquaniti
Simple arm movements involving forward projection of the hand toward a
target were studied by measuring simultaneous wrist position in three-
dimensional space and changes in elbow angle. An attempt was made to
identify those features of the movement which exhibit invariant
characteristics under the hypothesis that such invariances may reflect the
operations by which central processes participate in the organization of
the movement. The first such invariance to be identified was that the
trajectory in space is independent of movement speed. Secondly, the
movement can be viewed as consisting of two phases, an acceleratory phase
and a deceleratory one, with the movement during the acceleratory phase
being so organized as to maintain the ratio of elbow angular velocity to
shoulder angular velocity invariant with respect to target location in the
deceleratory phase. It is suggested that proprioceptive information is used
to control the movement and that the latter invariance may result from a
negative feedback of force involving tendon organ afferents.
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