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Related Experiment Videos

Deafferentation and pointing with visual double-step perturbations.

C Bard1, Y Turrell, M Fleury

  • 1Laboratoire de Performance Motrice Humaine PEPS, Université Laval, Ste-Foy, QC, Canada. chantal.bard@kin.msp.ulaval.ca

Experimental Brain Research
|May 14, 1999
PubMed
Summary

The brain can correct movement errors using internal feedback loops, even without sensory input. This highlights the importance of efferent copies for guiding movements toward a visual goal.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Movement reprogramming relies on internal feedback loops and efference copy for online regulation.
  • The precise mechanism for correcting motor commands (proprioceptive vs. efferent copy) remains debated.
  • Previous studies utilized the double-step paradigm to investigate motor response adjustments.

Purpose of the Study:

  • To investigate the role of internal feedback loops versus proprioceptive feedback in correcting movement trajectories.
  • To determine the contribution of efference copy in motor response adjustments.
  • To examine the impact of visual feedback and movement initiation timing on motor control in a deafferented individual.

Main Methods:

  • Utilized the double-step paradigm to assess pointing behavior.

Related Experiment Videos

  • Tested a deafferented subject under varying conditions of visual feedback.
  • Manipulated the delay between target presentation and arm movement initiation.

    • Main Results:

    • Demonstrated the motor system's capacity to correct movement trajectories using solely internal feedback loops.
    • Confirmed the critical role of the target jump/arm triggering delay in motor adjustments.
    • Emphasized the significance of the eye efference copy for spatial goal information.

    Conclusions:

    • Internal feedback loops are sufficient for correcting erroneous movement trajectories.
    • Efference copy plays a vital role in guiding movements toward a visual target.
    • Motor control adjustments can occur independently of continuous proprioceptive feedback.