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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

Through a prism darkly: re-evaluating prisms and neglect.

Christopher L Striemer1, James A Danckert

  • 1Department of Psychology, Centre for Brain and Mind, Social Sciences Centre, University of Western Ontario, London, Ontario, Canada, N6A 5C2.

Trends in Cognitive Sciences
|May 7, 2010
PubMed
Summary

Prism adaptation may help visual neglect symptoms by influencing visuomotor behaviors, not higher-level spatial perception. This offers a new view on how prisms aid patients with spatial attention deficits.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Psychology

Background:

  • Visual neglect is a disorder where patients ignore stimuli in contralesional space.
  • Prism adaptation is a common intervention for visual neglect symptoms.
  • Current theories suggest prisms affect higher-order visuospatial processing and attention circuits.

Purpose of the Study:

  • To propose an alternative explanation for the efficacy of prism adaptation in visual neglect.
  • To investigate the neural mechanisms underlying prism adaptation effects in neglect patients.
  • To differentiate the impact of prisms on visuomotor behaviors versus perceptual biases.

Main Methods:

  • Review of existing literature on prism adaptation and visual neglect.
  • Analysis of theoretical frameworks explaining prism adaptation.
  • Comparison of proposed mechanisms with empirical findings.

Main Results:

  • Prism adaptation's benefits may stem from influencing dorsal stream circuits controlling attention and visuomotor behaviors.
  • Evidence suggests prisms have limited impact on core perceptual biases in visual neglect.
  • Existing studies show minimal effects of prisms on inherent perceptual deficits.

Conclusions:

  • Prism adaptation's therapeutic effects in visual neglect likely involve visuomotor adaptation rather than higher-order perceptual changes.
  • The dorsal visual stream is a key target for prism adaptation's influence on attention and action.
  • A revised understanding of prism adaptation mechanisms is needed for visual neglect treatment.