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Manual asymmetries in the kinematics of a reach-to-grasp action

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In the present study, we manipulated the perceived demand of an ecologically valid task to investigate the possible presence of manual asymmetries in a reach-to-grasp action. Participants reached, grasped and sipped from a water glass under low (nearly empty) and high (nearly full) demand conditions. Participants reached to grasp in closed-loop, open-loop and delay visual conditions. Manual asymmetries were found in movement time, peak velocity and maximum grip aperture variability. Consistent with reach-to-point literature: (1) right-handed actions were completed in less time than left-handed actions in visually and memory-guided conditions; (2) right-handed movements were more accurate (i.e., produced more consistent maximum grip apertures) than left-handed movements in visually guided conditions. The results support a theory of left-hemisphere specialization for visual control of action.
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Keywords: Asymmetries; Demand; Kinematics; Left hand; Prehension

Document Type: Research Article

Affiliations: 1: The Brain in Action Laboratory, Department of Kinesiology and Physical Education, University of Lethbridge, Lethbridge, Canada 2: The Engineering & Human Performance Laboratory, Department of Kinesiology and Physical Education, University of Lethbridge, Lethbridge, Canada

Publication date: July 4, 2014

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