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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
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Related Experiment Video

Updated: Jul 7, 2026

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
07:04

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

Published on: March 10, 2021

Left visual neglect: is the disengage deficit space- or object-based?

Federica Rastelli1, Maria-Jesus Funes, Juan Lupiáñez

  • 1INSERM-UPMC UMRS 610, Pavillon Claude Bernard, Hôpital Salpêtrière, 47 bd de l'Hôpital, 75013, Paris, France. federicarastelli@hotmail.com

Experimental Brain Research
|February 28, 2008
PubMed
Summary

Patients with left unilateral spatial neglect show attentional bias not towards locations, but towards visual objects. This suggests spatial neglect is object-based, not purely space-based.

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Last Updated: Jul 7, 2026

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
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Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects

Published on: September 18, 2012

Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology
  • Visual Attention

Background:

  • Left unilateral spatial neglect is characterized by difficulty attending to the left side of space.
  • A key feature is the disengagement deficit (DD), where patients struggle to shift attention away from a cued location.
  • It remains debated whether this deficit is purely spatial or influenced by visual objects.

Purpose of the Study:

  • To investigate whether the disengagement deficit in left unilateral spatial neglect is influenced by the presence of visual objects.
  • To differentiate between a space-based versus an object-based attentional bias in neglect patients.

Main Methods:

  • Cued response time (RT) detection task administered to 10 right brain-damaged patients with left-neglect and 41 controls.
  • Two cueing conditions: onset cues (box brightening) and offset cues (box disappearance).
  • Varying stimulus-onset asynchronies (SOAs) between cue and target presentation.

Main Results:

  • Patients exhibited a typical disengagement deficit (DD) at short SOAs with onset cues.
  • The DD disappeared when offset cues were used, indicating no deficit when attention did not need to disengage from an object.
  • This suggests the attentional bias is not tied to spatial locations themselves.

Conclusions:

  • The findings indicate that the attentional bias in left unilateral spatial neglect is object-based rather than purely space-based.
  • Neglect patients' difficulty lies in disengaging attention from visual objects, not just spatial locations.