Separate Sources of Spatial Information for Distance and Location in Rapid Aiming Movements

in Motor Control

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Michael A. Khan
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Trevor Hale
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Michael I. Carry
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Ian M. Franks
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The purpose of this research was to examine the role of distance and location information in the production of rapid aiming movements. Participants performed an aiming task consisting of horizontal left-handed elbow flexion movements that translated to movements of a cursor on an oscilloscope screen. The location of the home position and the target on the oscilloscope screen were fixed but me initial angle of the elbow was varied randomly. Participants were informed mat the required distance was always constant. Initial impulse and error correction phases were analyzed to examine whether separate spatial codes for distance and position were used in the control of these two movement phases. The results indicated mat initial impulse endpoints and the final positions of the limb overshot the target from the leftmost starting positions, while they undershot me target from me rightmost starting positions. Also, varying the initial angle of the elbow had a greater influence on me final position of the limb than initial impulse endpoints.

M.A. Khan is with the School of Sport, Health, and Exercise Sciences at the University of Wales, Bangor, Gwynedd, Wales, LL57 2PX, UK. T. Hale, M.I. Garry, and I.M. Franks are with the School of Human Kinetics at the University of British Columbia, Vancouver, B.C., Canada V6T 1Z4.

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