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Changes in task parameters during walking prism adaptation influence the subsequent generalization pattern.

M Scott Alexander1, Brent W G Flodin, Daniel S Marigold

  • 1Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada.

Journal of Neurophysiology
|March 1, 2013
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Summary

Motor adaptation generalization depends on stepping sequences during walking. Specific sequences and task constraints, like obstacles, influence which leg shows aftereffects, suggesting proprioceptive feedback and perceived threat play roles.

Keywords:
fearlocomotiontransfer of learningvisionvisuomotor adaptation

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Area of Science:

  • Motor control
  • Human locomotion
  • Neuroplasticity

Background:

  • Understanding motor adaptation generalization across limbs and tasks is limited.
  • Previous studies show mixed results regarding interlimb and intertask transfer of walking adaptations.
  • The influence of specific stepping sequences and task constraints on generalization remains unclear.

Purpose of the Study:

  • To investigate how stepping sequences and task constraints affect motor adaptation generalization during walking.
  • To determine if altering stepping sequences influences the pattern of generalization between legs.
  • To examine the role of proprioceptive feedback and negative consequences in motor learning.

Main Methods:

  • Forty subjects performed prism-adaptation walking tasks (precision walking or obstacle avoidance) with specific stepping sequences.
  • Adaptation involved wearing prism glasses to induce a shift in visual-proprioceptive information.
  • Generalization was assessed by measuring aftereffects in a non-adapted task or with altered stepping sequences.

Main Results:

  • Reversing the stepping sequence in a precision-walking task led to generalization in the opposite leg.
  • In obstacle-avoidance tasks, specific stepping sequences and prism shifts caused collisions, leading to bilateral generalization.
  • A balanced stepping sequence in a precision task did not induce full bilateral generalization, but aftereffects indicated potential collisions.

Conclusions:

  • Stepping sequences during adapted walking tasks significantly contribute to generalization patterns.
  • Proprioceptive feedback likely plays a crucial role in mediating motor adaptation transfer.
  • Negative consequences during adaptation, such as perceived threat or collisions, can modulate generalization.