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Visual Agnosia

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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: May 8, 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

Coordinate frame for pattern recognition in unilateral spatial neglect.

M Pavlovskaya¹, I Glass, N Soroker

¹Loewenstein Rehabilitation Center, Raanana and Sackler Faculty of Medicine, Tel Aviv University.

Journal of Cognitive Neuroscience

|August 23, 2013

Summary

This summary is machine-generated.

Normal subjects use the luminance centroid (LC) for pattern recognition, while patients with visual neglect focus attention left of the LC. This highlights the role of object-centered attention in visual processing.

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Last Updated: May 8, 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

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

Area of Science:

Cognitive Neuroscience
Visual Perception
Neuropsychology

Background:

Spatial attention significantly influences pattern recognition.
Object-centered frames of reference are crucial for visual processing.
Left visual neglect in brain-damaged patients offers insights into attentional mechanisms.

Purpose of the Study:

To investigate the impact of spatial attentional constraints on pattern recognition.
To compare attentional allocation in normal individuals versus patients with left visual neglect.
To determine the role of the luminance centroid (LC) in object-centered attention.

Main Methods:

Utilized prelearned, letterlike patterns as stimuli with brief exposure times.
Employed precuing to direct attention to specific locations in object-centered space.
Assessed pattern recognition performance in normal subjects and right-hemisphere-damaged patients with left visual neglect.

Main Results:

Normal subjects exhibited optimal performance when attention was directed to the luminance centroid (LC) of the pattern.
Patients with left visual neglect showed improved recognition when attention was directed to the left of the LC.
Stimulus shifts affected attention allocation within an object-centered frame but not viewer-centered coordinates.

Conclusions:

The luminance centroid (LC) may act as a gravitational center for attention in normal pattern recognition, supporting an object-centered frame of reference.
Left visual neglect appears to disrupt this object-centered attentional mechanism, leading to performance deficits.
Findings elucidate the interplay between spatial attention, object-centered representations, and pattern recognition.