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Calibrating grasp size and reach distance: interactions reveal integral organization of reaching-to-grasp movements

Coats, R., Bingham, G.P and Mon-Williams, M. (2008) Calibrating grasp size and reach distance: interactions reveal integral organization of reaching-to-grasp movements. Experimental Brain Research, 189 (2). pp. 211-220. ISSN 0014-4819

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Abstract

Feedback is a central feature of neural systems and of crucial importance to human behaviour as shown in goal directed actions such as reaching-to-grasp. One important source of feedback in reach-to-grasp behaviour arises from the haptic information obtained after grasping an object. We manipulated the felt distance and/or size of a visually constant object to explore the role of haptic information in the calibration of reaching and grasping. Crucially, our design explored post-adaptation eVects rather than the previously documented role of haptic information in movement organisation. A post-adaptation reach-tograsp task showed: (1) distorted haptic feedback caused recalibration; (2) reach distance and grasp size could be calibrated separately but, if calibrated simultaneously, then (3) recalibration was greater when distance and size changed in a consistent (e.g. reaching for a larger object at a greater distance) rather than an inconsistent (e.g. a smaller object at a greater distance) fashion. These interactions reveal the integral nature of reach-to-grasp organization, that is, that reaching and grasping are integrated components of a single action system.

Item Type: Article
Keywords: prehension; motor control; calibration; somatosensory; haptic; feedback
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: 18 Jun 2009 14:46
Last Modified: 29 Sep 2010 14:24
Published Version: http://dx.doi.org/10.1007/s00221-008-1418-5
Status: Published
Publisher: Springer Verlag
Identification Number: 10.1007/s00221-008-1418-5
URI: http://eprints.whiterose.ac.uk/id/eprint/8655

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