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Postsaccadic visual references generate presaccadic compression of space.

M Lappe¹, H Awater, B Krekelberg

¹Department of Zoology and Neurobiology, Ruhr-University Bochum, Germany. lappe@neurobiologie.ruhr-uni-bochum.de

|March 8, 2000

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Visual perception relies on linking images during eye movements (saccades). This study shows that spatial references after a saccade are crucial for accurate visual localization, not before or during. This highlights the importance of postsaccadic visual information.

Area of Science:

Neuroscience
Cognitive Science
Vision Science

Background:

Stable visual perception requires associating image points across gaze shifts (saccades).
The brain may use extraretinal eye position signals or image content for spatial localization.
Previous findings on perisaccadic object displacement are inconsistent, varying with visual conditions.

Purpose of the Study:

To investigate how the availability of visual spatial references around saccades influences perisaccadic mislocalization.
To determine the temporal dependence of visual spatial localization on postsaccadic visual information.

Main Methods:

Manipulating the availability of visual spatial references at different times relative to saccades.
Measuring perisaccadic mislocalization of visual stimuli.

Related Experiment Videos

Analyzing the dependence of mislocalization on visual context.

Main Results:

Perisaccadic compression, a form of mislocalization, was observed only when visual references were available immediately after the saccade.
The presence of visual references before or during the saccade did not induce this compression.
Mislocalization magnitude and direction are critically dependent on postsaccadic visual information.

Conclusions:

Transsaccadic spatial localization primarily relies on visual information acquired after the eye movement.
The brain utilizes postsaccadic visual cues to stabilize spatial perception during gaze shifts.
This finding challenges models relying solely on extraretinal signals for saccadic compensation.