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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Temporal shift from velocity to position proprioceptive feedback control during reaching movements.

C Minos Niu1, Daniel M Corcos, Mark B Shapiro

  • 1University of Illinois at Chicago, Department of Bioengineering, Chicago, IL 60612, USA. cniu2@uic.edu

Journal of Neurophysiology
|August 27, 2010
PubMed
Summary

Proprioceptive feedback control is suppressed early in reaching movements, with velocity feedback dominating mid-movement and position feedback facilitating final target acquisition. Instructions to correct deviations influence late-stage position control.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Biomechanics

Background:

  • Reaching movements exhibit stereotypical kinematics, suggesting pre-planned trajectories.
  • The role of proprioceptive feedback in correcting kinematic deviations during reaching is not fully understood.

Purpose of the Study:

  • To investigate whether proprioceptive feedback control corrects deviations from planned reaching movement kinematics.
  • To differentiate the roles of velocity and position feedback control during reaching movements.

Main Methods:

  • Subjects performed center-forward reaching movements with a robotic manipulandum.
  • Randomly imposed servo-controlled velocity and position deviations were introduced.
  • Subjects were instructed to either "Attempt to correct" or "Do not correct" the deviations.

Main Results:

  • Early electromyogram responses to deviations were unaffected by instructions, reflecting velocity deviations.
  • Late electromyogram activity was modulated by instructions, indicating position feedback control.
  • The timing of feedback control shifted from velocity to position as the movement progressed.

Conclusions:

  • Proprioceptive feedback is initially suppressed, followed by velocity feedback, and finally position feedback control during reaching.
  • Motor commands adapt to utilize feedback control based on movement phase and explicit instructions.
  • This suggests a hierarchical control system for reaching movements, balancing pre-planned trajectories with real-time adjustments.