The synergistic organization of muscle recruitment constrains visuomotor adaptation

de Rugy, Aymar, Hinder, Mark R., Wooley, Daniel G. and Carson, Richard G. (2009) The synergistic organization of muscle recruitment constrains visuomotor adaptation. Journal of Neurophysiology, 101 5: 2263-2269. doi:10.1152/jn.90898.2008


Author de Rugy, Aymar
Hinder, Mark R.
Wooley, Daniel G.
Carson, Richard G.
Title The synergistic organization of muscle recruitment constrains visuomotor adaptation
Journal name Journal of Neurophysiology   Check publisher's open access policy
ISSN 0022-3077
Publication date 2009-02-18
Sub-type Article (original research)
DOI 10.1152/jn.90898.2008
Volume 101
Issue 5
Start page 2263
End page 2269
Total pages 7
Editor David Linden
Place of publication Bethesda, M.D, U.S.A.
Publisher American Psychological Society
Collection year 2010
Language eng
Subject C1
970117 Expanding Knowledge in Psychology and Cognitive Sciences
110603 Motor Control
1702 Cognitive Sciences
Abstract Reaching to visual targets engages the nervous system in a series of transformations between sensory information and motor commands. That which remains to be determined is the extent to which the processes that mediate sensorimotor adaptation to novel environments engage neural circuits that represent the required movement in joint-based or muscle-based coordinate systems. We sought to establish the contribution of these alternative representations to the process of visuomotor adaptation. To do so we applied a visuomotor rotation during a center-out isometric torque production task that involved flexion/extension and supination/pronation at the elbow-joint complex. In separate sessions, distinct half-quadrant rotations (i.e., 45�) were applied such that adaptation could be achieved either by only rescaling the individual joint torques (i.e., the visual target and torque target remained in the same quadrant) or by additionally requiring torque reversal at a contributing joint (i.e., the visual target and torque target were in different quadrants). Analysis of the time course of directional errors revealed that the degree of adaptation was lower (by ~20%) when reversals in the direction of joint torques were required. It has been established previously that in this task space, a transition between supination and pronation requires the engagement of a different set of muscle synergists, whereas in a transition between flexion and extension no such change is required. The additional observation that the initial level of adaptation was lower and the subsequent aftereffects were smaller, for trials that involved a pronation–supination transition than for those that involved a flexion–extension transition, supports the conclusion that the process of adaptation engaged, at least in part, neural circuits that represent the required motor output in a muscle-based coordinate system.
Keyword Isometric Torque Production
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Human Movement and Nutrition Sciences Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 14 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 16 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Wed, 25 Nov 2009, 12:28:20 EST by Deborah Noon on behalf of School of Human Movement and Nutrition Sciences