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The effect of obstacle position on reach-to-grasp movements

Mon-Williams, M., Tresilian, J.R., Coppard, V.L. and Carson, R.G. (2001) The effect of obstacle position on reach-to-grasp movements. Experimental Brain Research, 137 (3-4). pp. 497-501. ISSN 0014-4819

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Abstract

Numerous everyday tasks require the nervous system to program a prehensile movement towards a target object positioned in a cluttered environment. Adult humans are extremely proficient in avoiding contact with any non-target objects (obstacles) whilst carrying out such movements. A number of recent studies have highlighted the importance of considering the control of reach-to-grasp (prehension) movements in the presence of such obstacles. The current study was constructed with the aim of beginning the task of studying the relative impact on prehension as the position of obstacles is varied within the workspace. The experimental design ensured that the obstacles were positioned within the workspace in locations where they did not interfere physically with the path taken by the hand when no obstacle was present. In all positions, the presence of an obstacle caused the hand to slow down and the maximum grip aperture to decrease. Nonetheless, the effect of the obstacle varied according to its position within the workspace. In the situation where an obstacle was located a small distance to the right of a target object, the obstacle showed a large effect on maximum grip aperture but a relatively small effect on movement time. In contrast, an object positioned in front and to the right of a target object had a large effect on movement speed but a relatively small effect on maximum grip aperture. It was found that the presence of two obstacles caused the system to decrease further the movement speed and maximum grip aperture. The position of the two obstacles dictated the extent to which their presence affected the movement parameters. These results show that the anticipated likelihood of a collision with potential obstacles affects the planning of movement duration and maximum grip aperture in prehension.

Item Type: Article
Keywords: movement; planning; preparation; obstacle avoidance; prehension; human
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Medicine and Health (Leeds) > Institute of Psychological Sciences (Leeds) > Cognitive Psychology (Leeds)
Depositing User: Repository Officer
Date Deposited: 25 Jun 2009 11:40
Last Modified: 29 Sep 2010 14:24
Published Version: http://dx.doi.org/10.1007/s002210100684
Status: Published
Publisher: Springer Verlag
Identification Number: 10.1007/s002210100684
URI: http://eprints.whiterose.ac.uk/id/eprint/8681

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