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Dynamic coordination of body parts during prism adaptation

Martin, Tod A. and Norris, Scott A. and Greger, Bradley E. and Thach, W. Thomas (2002) Dynamic coordination of body parts during prism adaptation. Journal of Neurophysiology, 88 (4). pp. 1685-1694. ISSN 0022-3077. doi:10.1152/jn.2002.88.4.1685.

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We studied coordination across body parts in throwing during adaptation to prisms. Human subjects threw balls at a target before, during, and after wearing laterally shifting prism eyeglasses. Positions of head, shoulders, arm, and ball were video-recorded continuously. We computed body angles of eyes-in-head, head-on-trunk, trunk-on-arm, and arm-on-ball. In each subject, the gaze-throw adjustment during adaptation was distributed across all sets of coupled body parts. The distribution of coupling changed unpredictably from throw to throw within a single session. The angular variation among coupled body parts was typically significantly larger than angular variation of on-target hits. Thus coupled body parts changed interdependently to account for the high accuracy of ball-on-target. Principal components and Monte Carlo analyses showed variability in body angles across throws with a wide range of variability/stereotypy across subjects. The data support a model of a dynamic and generalized solution as evidenced by the distribution of the gaze-throw adjustment across body parts.

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Greger, Bradley E.0000-0002-6702-7596
Additional Information:© 2002 The American Physiological Society. Received April 23 2002; accepted in final form 24 June 2002. Published 1 October 2002. On a suggestion from R. Held, N. Daw, and T. Wiesel originally developed this task for teaching. This work was supported by National Institutes of Health grants to W. T. Thach (NS-12777) and to T. A. Martin (GM-07200). The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked ‘‘advertisement’’ in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
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Issue or Number:4
Record Number:CaltechAUTHORS:20140611-075631357
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46192
Deposited By: Tony Diaz
Deposited On:11 Jun 2014 16:36
Last Modified:10 Nov 2021 17:22

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