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Related Experiment Videos

When two hands are better than one: reduced timing variability during bimanual movements

L L Helmuth1, R B Ivry

  • 1Department of Psychology, University of California, Berkeley 94720, USA. helmuth@garnet.berkeley.edu

Journal of Experimental Psychology. Human Perception and Performance
|April 1, 1996
PubMed
Summary

Bimanual tapping tasks show reduced variability compared to single-hand tapping. This bimanual advantage stems from improved central timing control, not muscle synergy, suggesting integrated timing mechanisms enhance motor control.

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Area of Science:

  • Motor control research
  • Human movement science
  • Cognitive neuroscience

Background:

  • Repetitive tapping tasks are used to study motor control.
  • Variability in movement can be decomposed into central and peripheral components.
  • Previous research suggests bimanual coordination differs from single-limb coordination.

Purpose of the Study:

  • To investigate the source of the bimanual advantage in repetitive tapping.
  • To determine if the bimanual advantage relies on homologous muscle involvement.
  • To explore the role of central versus peripheral timing in bimanual coordination.

Main Methods:

  • Participants performed repetitive tapping tasks using single hands and both hands.
  • Movement variability was analyzed and decomposed into central and peripheral components.

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  • Comparison of bimanual tapping with homologous and non-homologous muscles was conducted.
  • Bimanual performance was compared between single individuals and different individuals.

    • Main Results:

    • Bimanual tapping demonstrated significantly reduced variability compared to single-hand tapping.
    • The bimanual advantage was primarily attributed to decreased central timing variability.
    • The benefit of bimanual tapping was observed even when non-homologous muscles were used.
    • The bimanual advantage was absent when movements were produced by different individuals, highlighting the requirement for a single performer.

    Conclusions:

    • The bimanual advantage in repetitive tapping arises from enhanced central timing control.
    • This advantage is independent of homologous muscle involvement, suggesting a more general timing mechanism.
    • The findings support a model where separate timing mechanisms for each effector are integrated within a single individual.
    • This integration of timing outputs is proposed as the underlying mechanism for improved bimanual motor consistency.