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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: Sep 17, 2025

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Saccades track visual associative memory processes with precision and sensitivity.

Simon Henin¹, Eden Tefera¹, Helen Borges¹

¹Comprehensive Epilepsy Center, NYU School of Medicine, NYU Langone Health, New York, NY 10016, USA.

Brain Communications

|June 30, 2025

Summary

This summary is machine-generated.

Eye tracking precisely detects memory decline by analyzing visual scanning patterns. This method sensitively identifies subtle memory impairments in temporal lobe epilepsy patients, outperforming standard cognitive tests.

Keywords:

eye tracking memory temporal lobe epilepsy

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Last Updated: Sep 17, 2025

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

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Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking

Published on: September 26, 2019

Area of Science:

Neuroscience
Cognitive Science
Ophthalmology

Background:

Vision is key to learning and memory formation, with the hippocampus binding experiences.
Eye tracking offers a potential method to assess hippocampal function and memory.
Subtle memory decline in temporal lobe epilepsy (TLE) patients often goes undetected by standard tests.

Purpose of the Study:

To determine if eye movements can sensitively detect memory variability within and between individuals.
To validate eye-tracking behavior against accuracy-based memory tests.
To identify distinct spatiotemporal scanning patterns associated with memory failures.

Main Methods:

14 healthy controls and 30 TLE patients performed a visual object association task.
Eye movements and pupil size were recorded during the task.
Data analyzed for saccade patterns, gaze time, trial entropy, and pupillary changes.

Main Results:

Eye-movement patterns predicted retrieval accuracy at the single-trial level.
Correct retrieval correlated with fewer saccades and organized search patterns.
TLE patients showed more chaotic scanning than controls, even in correct trials.
Diagnosis (healthy vs. TLE) predicted by scanning patterns and pupillary changes.

Conclusions:

Eye tracking provides a sensitive, continuous measure of associative memory function.
Scanning behavior captures meaningful variability in memory performance.
Eye tracking can detect subtle memory decline in TLE and other neuropsychiatric conditions.
This method offers precise behavioral phenotyping for research.