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Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
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Does monocular viewing improve target detection in hemispatial neglect?

C Serfaty1, N Soroker, J Glicksohn

  • 1Department of Stroke Rehabilitation, Loewenstein Rehabilitation Hospital, Raanana and Sackler School of Medicine, Tel-Aviv University, Ramat Aviv 69978, Israel.

Restorative Neurology and Neuroscience
|May 10, 2011
PubMed
Summary

Monocular viewing can improve unilateral spatial neglect (USN) in some patients with right-hemisphere damage. However, this effect is not solely explained by the Sprague effect, suggesting other factors are involved in visual attention recovery.

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Last Updated: Jun 2, 2026

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Ophthalmology

Background:

  • Large posterior-cortical lesions can cause unilateral spatial neglect (USN), mimicking human syndromes.
  • Recovery from USN in animals involves superior colliculus modulation, known as the Sprague effect.
  • The Sprague effect suggests monocular occlusion might alleviate hemineglect by reducing contralesional collicular activity.

Purpose of the Study:

  • To investigate the efficacy of monocular viewing in ameliorating left hemineglect in right-hemisphere damaged patients.
  • To explore whether the observed improvements align with the Sprague effect model.
  • To identify potential underlying mechanisms beyond the Sprague effect in visual attention recovery.

Main Methods:

  • Twenty-six patients with right-hemisphere damage and USN performed a cancellation task.
  • Performance was assessed under binocular, left-monocular, and right-monocular viewing conditions.
  • Improvements in left hemineglect were compared across different viewing conditions.

Main Results:

  • Thirteen patients (50%) showed reduced left hemineglect with left-monocular viewing compared to binocular viewing.
  • Two patients improved with right-monocular viewing, while eleven showed no significant change.
  • The results suggest the Sprague effect is not the sole explanation for monocular viewing benefits.

Conclusions:

  • Left-monocular viewing can ameliorate hemineglect in a subset of patients with right-hemisphere damage.
  • The Sprague effect may contribute but does not fully account for the observed improvements.
  • Interocular differences in target detection and other neural structures likely play a role in visual attention recovery.