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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

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

Object-mediated overwriting across saccades.

A Caglar Tas^1,2, J Toby Mordkoff^3,4, Andrew Hollingworth^3,5

¹Department of Psychology, University of Tennessee - Knoxville, TN, USA.

Journal of Vision

|February 4, 2021

Summary

This summary is machine-generated.

Visual perception across eye movements shows that new color information acquired after a saccade can overwrite older information. This object-mediated overwriting mechanism ensures updated visual representations are prioritized.

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Area of Science:

Neuroscience
Cognitive Psychology
Visual Perception

Background:

Understanding how visual information is processed and updated during eye movements is crucial for explaining visual perception.
Saccades, rapid eye movements, shift the fovea to new targets, raising questions about the integration of peripheral and foveal visual information.

Purpose of the Study:

To investigate whether post-saccadic visual information overwrites pre-saccadic information when perceived as belonging to the same object.
To determine the role of object correspondence in mediating this overwriting phenomenon across saccades.

Main Methods:

Participants performed saccades to colored targets that could change color during the saccade.
A continuous report procedure was used to assess pre-saccadic and post-saccadic color perception.
A post-saccadic blank interval was introduced to disrupt the perception of object correspondence.

Main Results:

Significant overwriting of pre-saccadic color by post-saccadic color was observed.
Disrupting object correspondence with a post-saccadic blank interval substantially reduced this overwriting.
This suggests an object-mediated mechanism influences visual representation updates across saccades.

Conclusions:

The study provides the first direct evidence for an object-mediated overwriting mechanism during saccades.
Post-saccadic visual values automatically replace pre-saccadic values when object continuity is perceived.
This mechanism is vital for updating visual representations efficiently during naturalistic viewing behavior.