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Force and Position Control in Humans - The Role of Augmented Feedback
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Reduced feedback barely slows down proprioceptive recalibration.

Jennifer E Ruttle1,2, Bernard Marius 't Hart1,3, Denise Y P Henriques1,2,3

  • 1Centre for Vision Research, York University, Toronto, Ontario, Canada.

Journal of Neurophysiology
|November 23, 2022
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Summary
This summary is machine-generated.

Altered visual feedback during reaching movements causes rapid shifts in felt hand position. Reducing visual feedback, by providing only terminal feedback or limiting movement errors, did not significantly slow these proprioceptive recalibration shifts.

Keywords:
adaptationfeedbackproprioceptionvisuomotor

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Visuomotor adaptation involves adjusting reaching movements based on altered visual feedback.
  • Previous research indicates rapid saturation of hand position estimates during adaptation.
  • The impact of reduced feedback quality on the speed of felt hand position shifts is not well understood.

Purpose of the Study:

  • To investigate if reducing visual feedback during visuomotor adaptation diminishes or slows shifts in felt hand position.
  • To compare the effects of terminal feedback and movement constraint on adaptation and hand localization.
  • To determine the robustness of proprioceptive recalibration to impoverished feedback conditions.

Main Methods:

  • Participants performed reaching movements under three conditions: classic visuomotor adaptation, terminal visual feedback, and constrained movements (exposure).
  • Hand position was continuously estimated throughout the adaptation process.
  • Adaptation and hand localization shifts were measured across different rotation angles (-30° and +30°).

Main Results:

  • Terminal feedback training slightly reduced the initial rate of overall adaptation.
  • The rate and asymptote of hand localization shifts were not noticeably different between impoverished feedback groups and the classic training group.
  • Proprioceptive recalibration, reflected in hand localization shifts, proved rapid and robust even with reduced sensory information.

Conclusions:

  • Shifts in felt hand position are rapid and robust responses to sensory prediction errors during visuomotor adaptation.
  • Reducing the quality of visual feedback has minimal impact on the speed and extent of these proprioceptive recalibration shifts.
  • Proprioceptive recalibration is likely an immediate contributor to reach adaptation, irrespective of feedback richness.