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Updated: Jun 25, 2026

Virtual Prism Adaptation Therapy: Protocol for Validation in Healthy Adults
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Prism adaptation overcomes pseudoneglect for the greyscales task.

Andrea M Loftus1, Nandita Vijayakumar, Michael E R Nicholls

  • 1School of Behavioural Science, University of Melbourne, VIC, Australia. andrea.loftus@uwa.edu.au

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|February 24, 2009
PubMed
Summary

Visuomotor adaptation using left-shifting prisms reversed a leftward bias in a greyscales task for normal participants. This adaptation did not affect performance with right-shifting prisms or control spectacles.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Perception

Background:

  • Visuomotor adaptation, the process by which the motor system adjusts to visual feedback, influences various cognitive tasks in neurologically intact individuals.
  • The greyscales task assesses perceptual biases in judging visual stimuli.
  • Understanding how sensorimotor adjustments impact perceptual tasks is crucial for cognitive science.

Purpose of the Study:

  • To investigate the effect of visuomotor adaptation on performance in the greyscales task.
  • To determine if adaptation to left-shifting prisms influences spatial attention distribution in the greyscales task.
  • To compare the effects of left-shifting prisms, right-shifting prisms, and control spectacles on greyscales task performance.

Main Methods:

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  • Forty-two neurologically intact participants completed the greyscales task.
  • Participants underwent adaptation to either left-shifting prisms, right-shifting prisms, or control spectacles.
  • Greyscales task performance was assessed before and after the adaptation period.

    • Main Results:

    • Participants exhibited a leftward bias in the greyscales task prior to adaptation.
    • Visuomotor adaptation to left-shifting prisms significantly reversed this leftward bias.
    • Adaptation to right-shifting prisms or control spectacles did not alter the observed bias.

    Conclusions:

    • Visuomotor adaptation, specifically to left-shifting prisms, can modulate spatial attention in the greyscales task.
    • This finding suggests a dynamic interplay between sensorimotor recalibration and perceptual judgments.
    • The results highlight the specificity of prism adaptation effects on attentional distribution.