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Related Experiment Videos

Body-centered visuomotor adaptation.

John J van den Dobbelsteen1, Eli Brenner, Jeroen B J Smeets

  • 1Department of Neuroscience, Erasmus MC, P.O. Box 1738, NL-3000 DR Rotterdam, The Netherlands. j.vandendobbelsteen@erasmusmc.nl

Journal of Neurophysiology
|March 5, 2004
PubMed
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Human visuomotor adaptation generalizes distortions, but this adaptation is not directly tied to eye or shoulder orientation. Findings suggest complex sensorimotor integration beyond simple egocentric frames.

Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Previous studies indicate humans adapt to visuomotor feedback distortions using egocentric rotations.
  • The specific reference frame (e.g., eye-centered vs. shoulder-centered) for this adaptation remains unclear.

Purpose of the Study:

  • To investigate whether visuomotor rotations are linked to the orientation of the eyes or the shoulder.
  • To determine the reference frame used in adapting to distorted visual feedback during arm movements.

Main Methods:

  • Participants performed reaching movements with a hand-held cube under distorted visual feedback conditions.
  • Distortions were applied as azimuthal shifts relative to either the eyes or the shoulder.
  • Adaptation was assessed through movement endpoints in test phases with and without visual feedback, using both the exposed and unexposed arms.

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Main Results:

  • For the exposed arm, movement endpoint changes closely matched the imposed distortions, differentiating between eye- and shoulder-centered rotations.
  • For the unexposed arm, adaptation effects were smaller and less consistent with the applied distortions.
  • Adaptation to visuomotor distortion did not appear directly linked to the orientation of the eyes or the exposed arm.

Conclusions:

  • While humans adapt to visuomotor distortions, the underlying reference frame is not solely dependent on eye or shoulder orientation.
  • Sensorimotor adaptation involves complex integration that may extend beyond simple egocentric frames of reference.