Neuromuscular adaptation during skill acquisition on a two degree-of-freedom target-acquisition task: Dynamic movement

Shemmell, J, Tresilian, JR, Riek, S, Barry, BK and Carson, RG (2005) Neuromuscular adaptation during skill acquisition on a two degree-of-freedom target-acquisition task: Dynamic movement. Journal of Neurophysiology, 94 5: 3058-3068. doi:10.1152/jn.00671.2004


Author Shemmell, J
Tresilian, JR
Riek, S
Barry, BK
Carson, RG
Title Neuromuscular adaptation during skill acquisition on a two degree-of-freedom target-acquisition task: Dynamic movement
Journal name Journal of Neurophysiology   Check publisher's open access policy
ISSN 0022-3077
Publication date 2005-01-01
Year available 2005
Sub-type Article (original research)
DOI 10.1152/jn.00671.2004
Open Access Status Not yet assessed
Volume 94
Issue 5
Start page 3058
End page 3068
Total pages 11
Editor B.B. Rauner
E. Marder
P.L. Strick
Place of publication Bethesda
Publisher Amer Physiological Society
Language eng
Subject C1
780108 Behavioural and cognitive sciences
380101 Sensory Processes, Perception and Performance
Abstract In this experiment, we examined the extent to which the spatiotemporal reorganization of muscle synergies mediates skill acquisition on a two degree-of-freedom (df) target-acquisition task. Eight participants completed five practice sessions on consecutive days. During each session they practiced movements to eight target positions presented by a visual display. The movements required combinations of flexion/extension and pronation/supination of the elbow joint complex. During practice sessions, eight targets displaced 5.4 cm from the start position ( representing joint excursions of 54) were presented 16 times. During pre- and posttests, participants acquired the targets at two distances (3.6 cm [36 degrees] and 7.2 cm [72 degrees]). EMG data were recorded from eight muscles contributing to the movements during the pre- and posttests. Most targets were acquired more rapidly after the practice period. Performance improvements were, in most target directions, accompanied by increases in the smoothness of the movement trajectories. When target acquisition required movement in both dfs, there were also practice-related decreases in the extent to which the trajectories deviated from a direct path to the target. The contribution of monofunctional muscles ( those producing torque in a single df) increased with practice during movements in which they acted as agonists. The activity in bifunctional muscles ( those contributing torque in both dfs) remained at pretest levels in most movements. The results suggest that performance gains were mediated primarily by changes in the spatial organization of muscles synergies. These changes were expressed most prominently in terms of the magnitude of activation of the monofunctional muscles.
Keyword Neurosciences
Physiology
Step-tracking Movements
Motor Control
Coordination
Wrist
Arm
Elbow
Q-Index Code C1
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 15:52:42 EST