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Related Experiment Videos

Visual neglect can be object-based or scene-based depending on task representation.

Gordon C Baylis1, Leslie L Baylis, Christopher L Gore

  • 1Attention and Perception Laboratory, Department of Psychology, University of South Carolina, Columbia, SC 29208, USA. gordon@sc.edu

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|May 26, 2004
PubMed
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Visual neglect can shift reference frames based on task instructions. Patients showed spatial neglect for the entire visual field or specific objects, demonstrating task-dependent reference frame alterations.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Visual neglect is a neurological disorder characterized by a failure to respond to stimuli on the side of space opposite to a brain lesion.
  • The spatial reference frame (e.g., egocentric, allocentric, object-based) underlying neglect is not fully understood.
  • Previous research suggests neglect is primarily retinotopic or head-centered.

Purpose of the Study:

  • To investigate whether the spatial reference frame of visual neglect can be altered by task instructions.
  • To determine if neglect is fixed to a hemifield or can be object-based.

Main Methods:

  • Three patients with visual neglect participated in the study.
  • Target letter detection was assessed at ipsilesional and contralesional locations on a monitor.

Related Experiment Videos

  • Detection was tested within the entire monitor display and within specific large shapes, with identical stimuli and responses.

    • Main Results:

    • When detecting targets across the entire monitor, patients exhibited neglect of the contralesional hemifield.
    • When detecting targets within specific objects, patients demonstrated object-based neglect.
    • The only difference between conditions was the represented space dictated by task instructions.

    Conclusions:

    • The reference frame of visual neglect is not fixed and can be modulated by task demands.
    • Task instructions can alter the spatial representation, leading to neglect of the contralesional side of the represented space.
    • This suggests a flexible and context-dependent nature of spatial representation in visual neglect.