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Related Experiment Videos

Interference between velocity-dependent and position-dependent force-fields indicates that tasks depending on

Paul M Bays1, J Randall Flanagan, Daniel M Wolpert

  • 1Sobell Department of Motor Neuroscience, Institute of Neurology, University College London, Queen Square, London, WC1N 3BG, UK. p.bays@ion.ucl.ac.uk

Experimental Brain Research
|April 28, 2005
PubMed
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Motor learning can be overwritten by new tasks, especially when they conflict. This study shows incomplete interference between dynamic transformations based on hand position and velocity, suggesting working memory conflicts influence motor memory retention.

Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Psychology

Background:

  • Motor learning allows adaptation to altered movement dynamics or visuomotor mappings.
  • Successive learning of opposing transformations (dynamic or visuomotor) often results in retrograde interference, where the first memory is overwritten.
  • Interference patterns vary depending on the type and structure of learned transformations.

Purpose of the Study:

  • To investigate interference between dynamic transformations dependent on different kinematic parameters (position vs. velocity).
  • To test the hypothesis that transformations relying on distinct kinematic parameters do not interfere.
  • To explore the role of working memory conflict in retaining motor memories.

Main Methods:

  • Participants learned sequential motor tasks involving dynamic transformations.

Related Experiment Videos

  • Transformations were designed to depend on either hand position or hand velocity.
  • The degree of retrograde interference was quantified by analyzing performance on the second task and subsequent retention of the first task.

    • Main Results:

    • Contrary to the hypothesis, interference was observed between dynamic transformations dependent on hand position and velocity.
    • This interference was incomplete, indicating partial retention of the first motor memory.
    • The findings suggest that the degree of representational conflict in working memory influences motor memory retention.

    Conclusions:

    • The hypothesis that distinct kinematic parameters prevent interference is incorrect.
    • Motor memories can interfere even when based on different kinematic parameters.
    • Incomplete interference supports the model where working memory conflict resolution impacts the persistence of motor memories.