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Updated: Jun 2, 2026

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

Published on: March 10, 2021

Shifting attention in viewer- and object-based reference frames after unilateral brain injury.

Alexandra List1, Ayelet N Landau, Joseph L Brooks

  • 1Department of Veterans Affairs Northern California Health Care System, Martinez, CA 94553, USA.

Neuropsychologia
|April 21, 2011
PubMed
Summary

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This study reveals that object-based reference frames significantly influence visual attention reorientation in patients with unilateral brain injury. Object-based neglect was observed, impacting target detection differently based on the injured hemisphere.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Unilateral brain injury can lead to attentional deficits.
  • Understanding reference frames (object-based vs. viewer-based) is crucial for visual attention.
  • Previous research has not fully elucidated the role of object-based reference frames in attention reorientation post-injury.

Purpose of the Study:

  • To investigate the roles of object- and viewer-based reference frames in reorienting visual attention.
  • To assess the influence of these reference frames after unilateral brain injury.
  • To compare the effects in right hemisphere injured (RHI) and left hemisphere injured (LHI) patients.

Main Methods:

  • A cueing design was employed with 16 RHI and 13 LHI patients.

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  • Cues were presented at midline, with targets lateralized relative to two displayed objects.
  • Performance was measured for lateralized target detection, analyzing viewer-based and object-based influences.

    • Main Results:

    • Contralesional detection was slower than ipsilesional detection.
    • Object-based neglect was observed: contralesionally, reorienting within the cued object was slower than to the uncued object.
    • Ipsilesionally, the effects were reversed, with no significant difference in object-based influences between RHI and LHI groups.

    Conclusions:

    • Object-based reference frames play a critical role in visual attention reorientation after unilateral brain injury.
    • The findings suggest distinct mechanisms for attentional processing in contralesional and ipsilesional visual fields.
    • These results contribute to understanding spatial neglect and the neural basis of attention.