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Related Experiment Videos

Intermittent practice facilitates stable motor memories.

Simon A Overduin1, Andrew G Richardson, Courtney E Lane

  • 1Department of Brain and Cognitive Sciences and McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|November 17, 2006
PubMed
Summary

Intermittent practice, not constant, is key for stabilizing motor memories. Experiencing forces intermittently helps retain learned movements and resist interference, unlike constant practice.

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Area of Science:

  • Motor control and learning
  • Neuroscience
  • Human adaptation

Background:

  • Humans adapt reaching movements to novel forces.
  • Previous studies conflict on whether motor memories stabilize or remain vulnerable to interference.
  • A recent study suggested motor memories are always vulnerable.

Purpose of the Study:

  • To reconcile conflicting findings on motor memory stability.
  • To investigate the role of practice conditions in motor memory stabilization.
  • To determine if intermittent practice enhances resistance to interference.

Main Methods:

  • Investigated human reaching movements under novel force conditions.
  • Manipulated the interspersion of 'catch trials' (force removal) during practice.

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  • Compared learning retention and interference resistance between constant and intermittent practice groups.

    • Main Results:

    • Subjects retained learning for a day without interference, regardless of catch trials.
    • In the presence of interference, only subjects with intermittent practice retained learning.
    • Intermittent practice conferred resistance to interference, suggesting dynamic motor memory stabilization.

    Conclusions:

    • Intermittent practice conditions are critical for stabilizing dynamic motor memories.
    • This contrasts with constant practice, which leaves memories vulnerable to interference.
    • Methodological details, like catch trial frequency, can reconcile discrepancies in motor learning research.