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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: Apr 21, 2026

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

Visual mislocalization during saccade sequences.

Eckart Zimmermann¹, Maria Concetta Morrone, David Burr

¹Cognitive Neurology Section, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany, ec.zimmermann@fz-juelich.de.

Experimental Brain Research

|November 6, 2014

Summary

This summary is machine-generated.

Visual perception shifts towards saccade targets during eye movements. This study found mislocalization primarily occurred during the first saccade, but shifted to the second with longer target presentation.

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Related Experiment Videos

Last Updated: Apr 21, 2026

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Published on: August 22, 2025

Area of Science:

Neuroscience
Cognitive Psychology
Visual Perception

Background:

Saccadic eye movements are rapid, ballistic movements.
Perisaccadic visual phenomena, like compression, alter object perception.
Understanding visual processing during saccades is crucial for visual neuroscience.

Purpose of the Study:

To investigate perisaccadic mislocalization during a double-step saccade paradigm.
To determine how probe dot timing affects perceived location relative to saccade targets.
To examine the influence of saccade target presentation duration on mislocalization.

Main Methods:

Utilized a double-step saccade paradigm.
Presented small probe dots at various times around two sequential saccades.
Measured the perceived location of probe dots relative to saccade targets.

Main Results:

Probe dots were mislocalized towards the first saccade target at its onset.
A lesser degree of mislocalization was observed towards the second saccade target during the first saccade.
Minimal mislocalization occurred at the onset of the second saccade.
Increased saccade target presentation duration led to mislocalization at the second saccade onset.

Conclusions:

Perisaccadic mislocalization is primarily associated with the first saccade in a double-step paradigm.
The timing and presentation duration of saccade targets significantly modulate visual mislocalization.
These findings contribute to understanding the dynamic nature of visual perception during eye movements.