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Motor skill learning can interfere with untrained limbs, impacting performance retention. This contralateral interference effect depends on the skill level of the interfering task, with implications for rehabilitation strategies.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Rehabilitation Science

Background:

  • Motor skill acquisition can lead to performance improvements in the contralateral limb.
  • Learning a new task can interfere with the retention of a previously learned task (task A interference).

Purpose of the Study:

  • To investigate if motor learning interference extends to the untrained contralateral limb.
  • To determine the relationship between skill acquisition in an interfering task and contralateral interference.

Main Methods:

  • Five groups practiced a ballistic finger flexion task, followed by a visuomotor accuracy task using the same limb.
  • Performance was assessed before training, after training, and after the interference task for both trained and untrained hands.
  • Corticospinal excitability was measured to correlate with behavioral changes.

Main Results:

  • Significant learning and interference effects were observed in both the trained and untrained limbs.
  • Contralateral interference was dependent on the skill level achieved in the interfering motor task.
  • Behavioral findings were associated with training-specific changes in corticospinal excitability.

Conclusions:

  • Motor skill learning can induce interference effects in the contralateral limb.
  • The magnitude of contralateral interference is modulated by the skill level of the interfering task.
  • These findings have potential relevance for optimizing rehabilitation strategies after neurological injury.