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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: Mar 30, 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 double-step saccades.

Eckart Zimmermann¹

¹Neuroscience Institute, National Research Council Pisa, Italy.

Frontiers in Systems Neuroscience

|November 6, 2015

Summary

This summary is machine-generated.

Perisaccadic compression, the apparent shrinking of visual space during eye movements, is linked to saccade planning. This visual compression effect is not solely dependent on the execution of saccades but rather on the cognitive planning involved.

Keywords:

compression double-step saccade mislocalization saccade visual space perception

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Area of Science:

Neuroscience
Cognitive Science
Visual Perception

Background:

Visual objects near saccade onset appear compressed towards the target.
This perisaccadic compression is reduced in double-step saccade sequences.
The role of saccade planning versus execution in this compression is unclear.

Purpose of the Study:

To investigate if perisaccadic compression is associated with saccade planning.
To differentiate the influence of saccade planning from execution factors on visual compression.

Main Methods:

Two double-step saccade paradigms were used: same-direction and reverse-direction.
Probe dots were flashed at various times around saccade execution.
Participants localized probe positions after completing saccade sequences.

Main Results:

Visual compression occurred during the first saccade but not the second in the same-direction paradigm.
Similar compression magnitudes were observed during both saccades in the reverse-direction paradigm.
Saccade parameter analysis suggested no preplanning of the saccade sequence in the reverse-direction paradigm.

Conclusions:

Perisaccadic compression is primarily linked to the planning phase of saccades.
Saccade execution factors alone do not fully explain the observed visual compression.
Cognitive processes underlying saccade planning are crucial for perisaccadic compression.