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Task-specific internal models for kinematic transformations.

Christine Tong1, J Randall Flanagan

  • 1Department of Psychology, Canadian Institutes of Health Research Group in Sensory-Motor Systems, and Centre for Neuroscience Studies, Queen's University, Kingston, Ontario K7L 3N6, Canada.

Journal of Neurophysiology
|August 9, 2003
PubMed
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Motor learning adapts to new visual feedback, but this adaptation is task-specific. Learning a visuomotor rotation in one task does not interfere with relearning it in another, suggesting distinct memory systems.

Area of Science:

  • Motor control
  • Cognitive neuroscience
  • Human movement science

Background:

  • Motor learning studies often examine adaptation to dynamic and visuomotor perturbations.
  • Adaptation to novel dynamics typically generalizes across different movement tasks.
  • Previous research suggests the formation of internal models for dynamic environments.

Purpose of the Study:

  • To investigate if task transfer occurs during visuomotor transformation learning.
  • To examine the specificity of memory resources for visuomotor rotations using a task interference paradigm.

Main Methods:

  • Subjects first adapted to a +30 degrees visuomotor rotation during reaching movements.
  • Subsequently, different groups adapted to a -30 degrees rotation using reaching, tracking, or drawing tasks.

Related Experiment Videos

  • Performance was retested the next day on the initial +30 degrees rotation reaching task.

    • Main Results:

    • Subjects who experienced opposing rotations in the same task showed no retention of the initial learning (retrograde interference).
    • Subjects who experienced opposing rotations in different tasks showed no retrograde interference.
    • Performance on day 2 was comparable to control subjects who did not experience opposing rotations.

    Conclusions:

    • Memory resources for visuomotor rotations appear to be task-specific.
    • Unlike dynamic learning, visuomotor adaptation does not readily generalize across different tasks.
    • This suggests distinct neural mechanisms or memory representations for different types of motor learning.