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The Oxford Compendium of Visual Illusions$
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Arthur G. Shapiro and Dejan Todorovic

Print publication date: 2017

Print ISBN-13: 9780199794607

Published to Oxford Scholarship Online: June 2017

DOI: 10.1093/acprof:oso/9780199794607.001.0001

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Contrast Asynchronies

Contrast Asynchronies

Chapter:
(p.767) Chapter 112 Contrast Asynchronies
Source:
The Oxford Compendium of Visual Illusions
Author(s):

Arthur G. Shapiro

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0112

Contrast asynchronies juxtapose color and color contrast information. The basic configuration of a contrast asynchrony consists of two identical disks whose luminance levels change in time from light to dark and back again; one disk is surrounded by a bright field and the other by a dark field; at 1Hz, observers report seeing the disks modulating in antiphase, yet also becoming light and dark at the same time. While such a configuration may look like a dynamic brightness illusion, the actual effect occurs because the visual system separates the in-phase luminance information from the antiphase contrast information. Variations of the contrast asynchrony paradigm can isolate different types of visual responses information.

Keywords:   contrast, brightness, illusion, contrast asynchronies, luminance

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