Adaptation to bimanual asymmetric weights in isometric force coordination

Xiaogang Hu*, Karl M. Newell

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


This study examined how different weighting coefficients imposed on individual finger force regulate bimanual finger force coordination patterns under the influence of bilateral coupling and visual information of the force output. The weighted sum of the two forces was computed as the total force output to match two target force levels (10% and 35% MVC) in separate conditions, and visual feedback of the total force output was provided in the experiment. The results revealed higher performance error at 35% in comparison with 10% MVC with the greatest error at the unequal coefficient setting. The correlation between the individual forces and the force output ratios correlated nonlinearly with the weighting coefficient ratios; however, the extent of change was much smaller than the coefficient ratios. The results suggest that bilateral coupling and task constraints interact to determine the coordination strategy. The irregularity of the individual finger forces increased with the weighting coefficient while the irregularity of the total force remained the same. The results support the hypothesis that the organization of redundant motor coordination patterns emerges from the interactive effect of the constraints on movement.

Original languageEnglish (US)
Pages (from-to)121-125
Number of pages5
JournalNeuroscience Letters
Issue number2
StatePublished - Feb 25 2011


  • Bilateral coupling
  • Constraints interaction
  • Isometric force
  • Motor control
  • Task constraint

ASJC Scopus subject areas

  • Neuroscience(all)


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