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Related Experiment Videos

Calibration and alignment are separable: evidence from prism adaptation.

G M Redding1, B Wallace

  • 1Illinois State University, Department of Psychology, Campus Box 4620, Normal, IL 61790-4620, USA. gredding@ilstu.edu

Journal of Motor Behavior
|December 6, 2001
PubMed
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Visibility of limb starting position during prism adaptation influences pointing accuracy. Visual feedback availability, however, separately determines aftereffects, suggesting distinct mechanisms for calibration and alignment.

Area of Science:

  • Motor control
  • Perceptual learning
  • Human motor performance

Background:

  • Prism adaptation is a model for understanding sensorimotor adaptation.
  • The roles of visual feedback and proprioceptive information in prism adaptation are debated.
  • Understanding these factors is crucial for explaining how the brain recalibrates movements.

Purpose of the Study:

  • To investigate how limb starting position visibility affects prism adaptation.
  • To determine the impact of visual feedback timing on prism adaptation aftereffects.
  • To differentiate the contributions of calibration and alignment processes.

Main Methods:

  • Two experiments were conducted involving prism exposure and target pointing tasks.
  • Participants' limb starting position visibility was manipulated (visible vs. not visible).

Related Experiment Videos

  • Visual feedback availability during pointing movements was varied (early vs. late).

    • Main Results:

    • Increased constant error and decreased variable error in pointing were observed when limb starting position was visible.
    • Prism adaptation aftereffects were dependent on visual feedback availability, irrespective of limb starting position visibility.
    • Calibration was linked to limb starting position visibility, while alignment was linked to visual feedback timing.

    Conclusions:

    • Limb starting position visibility plays a key role in the calibration of sensorimotor systems.
    • Visual feedback availability independently influences the alignment process during prism adaptation.
    • These findings suggest distinct neural mechanisms underlie calibration and alignment in motor learning.