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Related Experiment Video

Updated: Jun 2, 2026

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

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

Published on: March 10, 2021

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

Summary

Monocular viewing can improve unilateral spatial neglect (USN) in some patients with right-hemisphere damage. However, the Sprague effect may not be the sole explanation for this 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

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

Published on: March 10, 2021

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Published on: July 21, 2020

Area of Science:

Neuroscience
Cognitive Psychology
Ophthalmology

Background:

Large posterior-cortical lesions in experimental animals cause visual perception and behavior disturbances, similar to human unilateral spatial neglect (USN).
Recovery from USN in animals involves lesions to the superior colliculus (SC) or intercollicular pathways, potentially via the 'Sprague effect' (disinhibition of ipsilesional SC).

Purpose of the Study:

To investigate if monocular occlusion, inspired by the Sprague effect, can alleviate hemineglect in human patients.
To explore the role of interocular differences in target detection in right-hemisphere damaged patients with USN.

Main Methods:

Twenty-six right-hemisphere damaged patients with USN performed a cancellation task.
Performance was assessed under binocular, left-monocular, and right-monocular viewing conditions.

Main Results:

Thirteen patients 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 under monocular conditions.

Conclusions:

Left-monocular viewing ameliorated hemineglect in a subset of patients, superficially resembling the Sprague effect.
The Sprague effect may contribute to the benefits of monocular viewing, but other factors likely mediate interocular differences in target detection and USN recovery.