Document Detail

Interlimb coupling strength scales with movement amplitude.
MedLine Citation:
PMID:  18423866     Owner:  NLM     Status:  MEDLINE    
The relation between movement amplitude and the strength of interlimb interactions was examined by comparing bimanual performance at different amplitude ratios (1:2, 1:1, and 2:1). For conditions with unequal amplitudes, the arm moving at the smaller amplitude was predicted to be more strongly affected by the contralateral arm than vice versa. This prediction was based on neurophysiological considerations and the HKB model of coupled oscillators. Participants performed rhythmic bimanual forearm movements at prescribed amplitude relations. After a brief mechanical perturbation of one arm, the relaxation process back to the initial coordination pattern was examined. This analysis focused on phase adaptations in the unperturbed arm, as these reflect the degree to which the movements of this arm were affected by the coupling influences stemming from the contralateral (perturbed) arm. The thus obtained index of coupling (IC) reflected the relative contribution of the unperturbed arm to the relaxation process. As predicted IC was larger when the perturbed arm moved at a larger amplitude than did the unperturbed arm, indicating that coupling strength scaled with movement amplitude. This result was discussed in relation to previous research regarding sources of asymmetry in coupling strength and the effects of amplitude disparity on interlimb coordination.
C Lieke E Peper; Betteco J de Boer; Harjo J de Poel; Peter J Beek
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Publication Detail:
Type:  Journal Article     Date:  2008-03-28
Journal Detail:
Title:  Neuroscience letters     Volume:  437     ISSN:  1872-7972     ISO Abbreviation:  Neurosci. Lett.     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-05-05     Completed Date:  2009-06-15     Revised Date:  2009-06-23    
Medline Journal Info:
Nlm Unique ID:  7600130     Medline TA:  Neurosci Lett     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  10-4     Citation Subset:  IM    
Research Institute MOVE, Faculty of Human Movement Sciences, VU University Amsterdam, Amsterdam, The Netherlands. C E
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MeSH Terms
Arm / physiology*
Feedback / physiology
Functional Laterality / physiology*
Movement / physiology*
Muscle Strength / physiology*
Photic Stimulation
Psychomotor Performance / physiology
Young Adult

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