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Visual Agnosia

Visual Agnosia

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: Dec 21, 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

E-TAN, a technology-enhanced platform with tangible objects for the assessment of visual neglect: A multiple

Antonio Cerrato¹, Daniela Pacella¹, Francesco Palumbo¹

¹Departments of Humanities and Political Sciences, University of Naples Federico II, Naples, Italy.

Neuropsychological Rehabilitation

|May 19, 2020

Summary

A new technology-enhanced Baking Tray Task (E-BTT) accurately assesses visual neglect after right brain damage. This digital tool offers a sensitive and ecologically valid method for diagnosing and monitoring neglect patients.

Keywords:

Attention diagnosis follow-up rehabilitation stroke visual neglect

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Last Updated: Dec 21, 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

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

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Published on: April 11, 2025

Eye-Tracking Control to Assess Cognitive Functions in Patients with Amyotrophic Lateral Sclerosis

Eye-Tracking Control to Assess Cognitive Functions in Patients with Amyotrophic Lateral Sclerosis

Published on: October 13, 2016

Area of Science:

Neuroscience
Cognitive Psychology
Rehabilitation Technology

Background:

Visual neglect is a common and debilitating outcome of right hemisphere brain damage.
Conventional paper-and-pencil neglect tests lack sensitivity and real-world applicability.
The Baking Tray Task (BTT) offers a more ecologically valid assessment by simulating object placement in a spatial context.

Purpose of the Study:

To introduce E-TAN, a technology-enhanced platform for the Baking Tray Task (E-BTT).
To evaluate the efficacy of E-BTT in discriminating between patients with and without visual neglect.
To present a novel analytical method using convex hull analysis for spatial processing assessment.

Main Methods:

Development and implementation of the E-TAN platform for automated BTT assessment.
Testing 9 patients with right hemisphere damage and 115 healthy controls using E-BTT.
Analysis of object placement data using a novel convex hull method to estimate spatial coverage.

Main Results:

E-BTT automatically records object locations, placement sequences, and timing.
The convex hull analysis effectively differentiated between neglect patients and controls.
Performance metrics derived from E-BTT demonstrated high sensitivity to visual neglect.

Conclusions:

E-TAN provides a convenient, fast, and automated method for assessing visuospatial performance.
The E-BTT and its analysis method offer improved sensitivity and ecological validity over traditional tests.
This technology facilitates at-home monitoring of visual neglect and rehabilitation progress.