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Related Experiment Video

Updated: May 23, 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

Superior colliculi involvement in poststroke unilateral spatial neglect: a pilot study.

Tatiana Ogourtsova¹, Nicol Korner-Bitensky, Sandra E Leh

¹School of Physical and Occupational Therapy, McGill University, Montreal, Quebec, Canada.

Topics in Stroke Rehabilitation

|March 23, 2012

Summary

Investigating the spatial summation effect (SSE) in patients with unilateral spatial neglect (USN) after stroke reveals potential links to superior colliculi (SC) function. Abnormal SSE and fixation issues were observed in USN patients, suggesting new rehabilitation strategies.

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Randomized, Triple-Blind, and Parallel-Controlled Trial of Transcranial Direct Current Stimulation for Cognitive Rehabilitation after Stroke

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Published on: June 6, 2025

Area of Science:

Neuroscience
Ophthalmology
Rehabilitation Medicine

Background:

Unilateral spatial neglect (USN) is a neurological condition following stroke, with unclear underlying neural mechanisms.
The superior colliculi (SC) are implicated in USN, and the spatial summation effect (SSE) may serve as a behavioral indicator of SC function.

Purpose of the Study:

To assess the feasibility of using the SSE to investigate the SC's contribution to post-stroke USN.
To explore differences in SSE between individuals with and without USN, and controls.

Main Methods:

The study involved three groups: participants with USN (USN+), participants without USN (USN-), and controls.
Participants were tested under binocular and monocular viewing conditions, responding to unilateral and bilateral stimuli.
The SSE paradigm was administered to control and USN- groups.

Main Results:

USN+ participants exhibited poor visual fixation and higher contrast sensitivity for left-sided stimuli, hindering SSE task completion.
Controls demonstrated a typical SSE under both viewing conditions.
USN- participants showed an abnormal SSE, with faster reaction times to bilateral stimuli compared to unilateral-left stimuli.

Conclusions:

This research is the first to explore SC involvement in post-stroke USN using the SSE.
Findings indicate heightened contrast sensitivity and impaired fixation in the USN+ group.
The results suggest potential pathways for developing novel rehabilitation interventions for USN.