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Reaction time differences in spatially constrained bilateral and unilateral movements

Citation

Garry, MI and Franks, IM, Reaction time differences in spatially constrained bilateral and unilateral movements, Experimental Brain Research, 131, (2) pp. 236-243. ISSN 0014-4819 (2000) [Refereed Article]

DOI: doi:10.1007/s002219900299

Abstract

Previous investigations of bilateral-unilateral reaction time (RT) differences have reported equivocal findings. Studies where bilateral RT has been found longer than unilateral RT have often emphasized movement precision, while studies reporting non-significant differences have placed little emphasis on precision. To test the hypothesis that movement precision is an important factor in the bilateral unilateral difference, we investigated the influence of changes in spatial accuracy constraints on RT for unilateral and bilateral movements. Ten self-declared right-handed subjects performed fast and accurate 45° unilateral and bilateral elbow flexion movements to small (1.5°) and large (12.0°) targets. For bilateral movements, spatial accuracy was emphasized for only one arm (the 'aiming' arm), while the contralateral ('mirroring') arm performed a simultaneous flexion movement with no emphasis on movement accuracy. We found that while changes in target size had no significant effect on movement latency, changing the hand (right vs left) for which accuracy was emphasized did. When subjects performed right-arm aiming, bilateral movements, unilateral and bilateral RT did not differ significantly. In contrast, when subjects performed left-arm aiming, bilateral movements, RT was significantly longer than for unilateral movements. We conclude that while spatial accuracy per se (i.e., target size) does not differentiate bilateral and unilateral movements, the role of the left hand (i.e., aiming vs mirroring) does. Differences in the hemispheric control of right- and left-hand aiming movements are discussed.

Item Details

Item Type:Refereed Article
Research Division:Medical and Health Sciences
Research Group:Human Movement and Sports Science
Research Field:Motor Control
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in Philosophy and Religious Studies
Author:Garry, MI (Dr Michael Garry)
ID Code:34966
Year Published:2000
Web of Science® Times Cited:26
Deposited By:Psychology
Deposited On:2005-08-01
Last Modified:2011-10-04
Downloads:0

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