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Size aftereffect is non-local.

Ecem Altan¹, Huseyin Boyaci²

¹A.S. Brain Research Center & National Magnetic Resonance Research Center (UMRAM), Bilkent University, Ankara, Turkey; Department of Psychology, Bilkent University, Ankara, Turkey.

Vision Research

|August 11, 2020

Summary

This summary is machine-generated.

Size adaptation affects perceived size not just locally, but across the entire visual space. This study shows that adapting to one size distorts perception of other sizes, demonstrating a widespread effect on visual perception.

Keywords:

Perceived size Size adaptation Size aftereffect Temporal context Visual adaptation

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Area of Science:

Visual perception
Perceptual adaptation
Psychophysics

Background:

Prolonged exposure to a stimulus alters perception of subsequent stimuli at the same location.
The effect of size adaptation on the rest of the visual space remains understudied.

Purpose of the Study:

To investigate the spatial extent of size adaptation effects.
To determine if size adaptation influences perceived size beyond the immediate adaptation location.

Main Methods:

Used peripherally presented discs and rings as adapter and target stimuli.
Observers adapted to a mid-sized stimulus and then judged the size of subsequent target stimuli.
Tested adaptation effects at the adapter location and other visual space locations.

Main Results:

Perceived sizes of target stimuli were repelled away from the adapter size.
This repulsion effect was observed not only at the adaptation location but also at other locations.
Size adaptation causes widespread distortions in perceived visual space.

Conclusions:

Size adaptation has a broad impact on visual spatial perception.
The findings suggest a global mechanism underlying size adaptation.
Further research into computational models for this perceptual effect is warranted.