Body-goal variability mapping in an aiming task

Biological cybernetics
Joseph P. Cusumano, Paola Cesari

Abstract

Given the number of joints and muscles in the human body, there are typically an infinite number of ways to perform the same action, a feature of directed movements known as equifinality (Bernstein, The coordination and regulation of movements, Oxford, Pergamon, 1967). Here we present a new type of performance analysis based on the idea of a body-goal variability mapping. We show how this mapping arises naturally from the idea of a goal function that theoretically defines a task and, in the presence of equifinality, determines the set of all possible task solution strategies, the goal equivalent manifold (GEM). The approach also yields estimates of the sensitivity of goal-level errors to body-level perturbations, and we derive a general formula expressing the relationship between the two. We apply these ideas to the analysis of redundant kinematic data from subjects performing an aiming task carried out with and without a laser pointer. It is shown that in order to characterize performance one must consider two factors in addition to the body variability: first, the degree of alignment between body variability and the GEM; and second, the sensitivity parameters that control the degree to which goal-relevant body variability is ...Continue Reading

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Citations

Mar 11, 2008·Experimental Brain Research·Deanna H Gates, Jonathan B Dingwell
Oct 28, 2008·Experimental Brain Research·R G Cohen, D Sternad
Jun 6, 2009·Experimental Brain Research·Jasper T YenYoung-Hui Chang
Nov 28, 2009·Experimental Brain Research·Felix EhrlenspielDagmar Sternad
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Mar 29, 2011·Experimental Brain Research·Julius VerrelNicolas Vuillerme
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Jul 5, 2012·Journal of Biomechanical Engineering·Hung P Nguyen, Jonathan B Dingwell
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Oct 12, 2012·Journal of Neurophysiology·Jonathan B DingwellJoseph P Cusumano
Jun 23, 2012·Journal of Neurophysiology·Rajiv Ranganathan, Chandramouli Krishnan
Apr 28, 2010·PLoS Computational Biology·Dagmar SternadNeville Hogan
Jul 27, 2010·PLoS Computational Biology·Jonathan B DingwellJoseph P Cusumano
Oct 4, 2011·PLoS Computational Biology·Dagmar SternadHermann Müller
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Oct 18, 2012·Exercise and Sport Sciences Reviews·Rajiv Ranganathan, Karl M Newell
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