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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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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 28 September 2021

Contrast Asynchronies

Contrast Asynchronies

(p.767) Chapter 112 Contrast Asynchronies
The Oxford Compendium of Visual Illusions

Arthur G. Shapiro

Oxford University Press

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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