PMID: 3772433Nov 1, 1986Paper

Step-tracking movements of the wrist in humans. I. Kinematic analysis

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
D S Hoffman, P L Strick

Abstract

We have examined the kinematics of the initial trajectory of step-tracking movements performed by human subjects. Each subject tracked a target that required 5-30 degrees of radial or ulnar deviation of the wrist. All movements were to be performed as accurately as possible. Speed instructions were given before each trial. When subjects performed different amplitude movements following the same speed instruction, the peaks of velocity, acceleration, and jerk were linearly related to peak displacement. The peaks of velocity, acceleration, and jerk also changed when the speed instruction was altered. Thus, for any given movement, the peak values of the derivatives of displacement were dependent on both movement amplitude and intended speed. As a result, the peak values of the derivatives cannot be used by themselves to control or monitor peak displacement. When subjects performed different amplitude movements following the same speed instruction, movement duration tended to remain constant. In contrast, movement duration changed when the speed instruction was altered. Movements performed when subjects intended to move slowly had longer durations than when subjects intended to move quickly. These results suggest that subjects voli...Continue Reading

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The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
D S Hoffman, P L Strick
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