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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: Nov 23, 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

Impact of microsaccades on visual shape processing.

Ken W S Tan¹, Chris Scholes¹, Neil W Roach¹

¹Nottingham Visual Neuroscience Group, School of Psychology, University of Nottingham, Nottingham, United Kingdom.

Journal of Neurophysiology

|December 30, 2020

Summary

This summary is machine-generated.

Small eye movements called microsaccades impact shape discrimination, impairing performance when they occur near stimulus onset but not affecting global shape integration. This reveals how microsaccades influence visual processing.

Keywords:

fixational saccades global integration microsaccades radial frequency patterns shape processing

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Last Updated: Nov 23, 2025

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

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Using Saccadometry with Deep Brain Stimulation to Study Normal and Pathological Brain Function

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Published on: July 14, 2016

Area of Science:

Visual Neuroscience
Perception Psychology

Background:

Global pooling integrates local form information for shape perception.
Prolonged fixation may disrupt global structure processing.
The impact of microsaccades on complex visual processing remains unclear.

Purpose of the Study:

Investigate how microsaccades affect global processing of radial frequency (RF) patterns.
Determine if microsaccades disrupt the integration of local form information across space.

Main Methods:

Recorded eye movements at 500 Hz during shape discrimination tasks.
Used a velocity-based algorithm to detect microsaccades.
Sorted trials based on the timing of microsaccades relative to stimulus onset.

Main Results:

Shape discrimination thresholds showed perisaccadic changes.
Microsaccades near stimulus onset impaired performance.
Microsaccades occurring shortly after stimulus onset facilitated performance.
Global shape integration remained unaffected by microsaccade timing.

Conclusions:

Microsaccades modulate discrimination sensitivity to briefly presented shapes.
Microsaccades do not disrupt the spatial pooling of local form signals.
A dissociation exists in microsaccades' impact on shape perception and global integration.