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Related Experiment Video

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Virtual Prism Adaptation Therapy: Protocol for Validation in Healthy Adults
06:12

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Published on: February 12, 2020

Spatial compression impairs prism adaptation in healthy individuals.

Rachel J Scriven1, Roger Newport

  • 1School of Psychology, University of Nottingham Nottingham, UK.

Frontiers in Human Neuroscience
|May 16, 2013
PubMed
Summary

Prism adaptation (PA) may help neglect patients by altering spatial representation. This study in healthy individuals suggests distorted visual space reduces strategic control and aftereffects, modeling neglect symptoms.

Keywords:
MIRAGE mediated realityPAerror-detection thresholdneglectprism aftereffectsspatial compressionstrategic motor control

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Rehabilitation Science

Background:

  • Unilateral neglect involves inattention to one side of space after brain damage.
  • Prism adaptation (PA) can improve neglect symptoms, but its mechanisms are unclear.
  • Conscious strategic control (SC) in PA may be impaired in neglect patients, leading to prolonged aftereffects.

Purpose of the Study:

  • To model two proposed mechanisms for reduced SC in neglect patients within healthy participants.
  • To investigate if altered visual space affects SC and aftereffects during PA.
  • To compare PA performance in compressed visual space to control and noise conditions.

Main Methods:

  • Healthy participants underwent PA in a mediated reality environment (MIRAGE).
  • Visual feedback during PA was manipulated: compressed, noisy, or veridical.
  • Reaching errors were recorded before, during, and after adaptation to assess SC and aftereffects.

Main Results:

  • Compressed visual space significantly reduced SC and aftereffects compared to control and noise conditions.
  • These findings align with observations of impaired SC and prolonged aftereffects in neglect patients.
  • The results suggest a distorted spatial representation may underlie neglect performance during PA.

Conclusions:

  • Altered spatial representation, specifically visual space compression, can impair strategic control and prolong aftereffects during prism adaptation.
  • This provides a potential model for understanding neglect patient performance during PA.
  • The findings support the therapeutic potential of PA by highlighting the role of spatial representation in rehabilitation.