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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...

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Related Experiment Video

Updated: Nov 18, 2025

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

The 3s Spreadsheet Test version 2 for assessing egocentric viewer-centered and allocentric stimulus-centered spatial

Peii Chen^1,2, Joan Toglia^3,4

¹Center for Stroke Rehabilitation Research, Kessler Foundation, West Orange, NJ, USA.

Applied Neuropsychology. Adult

|February 8, 2021

Summary

The 3s Spreadsheet Test (3S-v2 Test) helps assess spatial neglect after stroke. Findings show allocentric neglect is independent of egocentric neglect, improving assessment comprehensiveness.

Keywords:

Allocentric neglect Unilateral spatial neglect assessment development egocentric neglect frame of reference normative data visuospatial neglect

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Area of Science:

Neuroscience
Cognitive Psychology
Rehabilitation Medicine

Background:

Spatial neglect is a common deficit following right brain stroke.
Egocentric and allocentric frames of reference are crucial for spatial processing.
Current assessment tools may not fully capture the nuances of neglect subtypes.

Purpose of the Study:

To establish normative data for the 3s Spreadsheet Test version 2 (3S-v2 Test).
To compare the performance of individuals with spatial neglect to these norms.
To investigate the independence of allocentric neglect from egocentric neglect.

Main Methods:

Normative data collected from 186 healthy adults using the 3S-v2 Test.
Performance of 23 right brain stroke patients with spatial neglect assessed.
Patients also completed the Apples Test and Scene Copying Test for neglect classification.

Main Results:

18 patients (78.3%) exhibited both egocentric and allocentric neglect.
Three patients (13.0%) showed isolated egocentric neglect, and two (8.7%) isolated allocentric neglect.
No significant correlation found between allocentric neglect severity and egocentric stimulus location.

Conclusions:

The 3S-v2 Test offers a functionally relevant addition to neglect assessment.
Allocentric neglect symptoms appear to be independent of egocentric spatial locations.
Comprehensive neglect assessment may benefit from including tasks differentiating reference frames.