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Study Motor Skill Learning by Single-pellet Reaching Tasks in Mice
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Optimizing effort: increased efficiency of motor memory with time away from practice.

Sarah E Pekny1, Reza Shadmehr2

  • 1Laboratory for Computational Motor Control, Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, Maryland sep205@gmail.com.

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|October 31, 2014
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Summary

Motor learning improves efficiency by reducing task-irrelevant commands. Extensive practice alone is insufficient; sufficient time away from practice is crucial for optimizing motor output and reducing effort.

Keywords:
generalizationlong-term trainingmotor learning

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Area of Science:

  • Motor control
  • Motor learning
  • Neuroscience

Background:

  • Motor task efficiency relies on producing task-relevant commands and avoiding task-irrelevant ones.
  • Current understanding suggests motor commands are optimized through trial-and-error learning via practice.
  • However, task-irrelevant commands often persist even with extensive training.

Purpose of the Study:

  • To investigate whether motor command efficiency can be improved beyond practice alone.
  • To determine if time away from practice influences the reduction of task-irrelevant motor output.
  • To explore the role of effort as an indicator of motor inefficiency.

Main Methods:

  • Human volunteers were trained to perform reaching movements in a force field.
  • Learning involved producing task-relevant forces to compensate for the field.
  • Generalization of learning was tested, with generalized forces designed to be task-irrelevant.

Main Results:

  • Extensive practice led to learning compensatory forces but also produced persistent task-irrelevant forces.
  • Task-irrelevant force production spontaneously decreased after 6 or 24 hours away from practice.
  • Short breaks (3 or 30 minutes) did not result in a reduction of task-irrelevant forces.

Conclusions:

  • Practice alone is insufficient for optimizing motor command efficiency.
  • Sufficient time away from practice is a necessary factor for reducing task-irrelevant motor output.
  • Effort reduction in motor tasks requires both practice and consolidation periods.