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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...

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Related Experiment Video

Updated: Jul 1, 2026

Virtual Prism Adaptation Therapy: Protocol for Validation in Healthy Adults
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Published on: February 12, 2020

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Virtual prism adaptation for spatial neglect: A double-blind study.

Alexia Bourgeois1, Francesco Turri2, Armin Schnider1,2

  • 1Laboratory of Cognitive Neurorehabilitation, Division of Neurorehabilitation, Faculty of Medicine, University of Geneva, Geneva, Switzerland.

Neuropsychological Rehabilitation
|January 7, 2021
PubMed
Summary
This summary is machine-generated.

Virtual prismatic adaptation (PA) did not improve spatial neglect symptoms in patients, despite showing effects on open-loop pointing. This challenges the efficacy of PA as a rehabilitation method for spatial neglect.

Keywords:
Double-blindPrism adaptationRehabilitationSpatial neglectVirtual reality

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Virtual Reality

Background:

  • Prismatic adaptation (PA) using wedge prisms is a non-invasive technique for spatial neglect rehabilitation.
  • Achieving adequate blinding with wedge prisms is difficult, making PA's benefit controversial.
  • Virtual reality offers a potential alternative for double-blind studies of PA.

Purpose of the Study:

  • To investigate if virtual PA at varying deviation angles can alleviate spatial neglect symptoms.
  • To assess the double-blind efficacy of virtual PA in neglect rehabilitation.
  • To examine visuo-motor transfer effects of virtual PA.

Main Methods:

  • Fifteen patients with spatial neglect underwent three virtual PA sessions (0°, 15°, 30° deviation).
  • Performance was assessed using line bisection and item cancellation tasks before and after adaptation.
  • Session allocation was concealed from participants and the examiner.

Main Results:

  • Virtual PA demonstrated dose-dependent effects on Open-Loop Pointing (OLP).
  • No significant transfer of adaptation was observed in line bisection or item cancellation tasks.
  • Patients did not perceive differences between adaptation sessions, indicating successful blinding.

Conclusions:

  • Virtual PA induces adaptation in OLP but does not transfer to standard neglect assessments.
  • The findings question the general effectiveness of PA, including virtual forms, for spatial neglect rehabilitation.
  • Robust adaptation effects in OLP without behavioral transfer cast doubt on PA's clinical utility for neglect.