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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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Second-Order Mach Bands, Chevreul, and Craik-O’Brien-Cornsweet Illusions

Second-Order Mach Bands, Chevreul, and Craik-O’Brien-Cornsweet Illusions

(p.404) Chapter 53 Second-Order Mach Bands, Chevreul, and Craik-O’Brien-Cornsweet Illusions
The Oxford Compendium of Visual Illusions

Zhong-Lin Lu

George Sperling

Oxford University Press

Second-order texture illusions, corresponding to Mach bands, Chevreul, and Craik-O’Brien-Cornsweet illusions in brightness perception, are generated by replacing luminance modulations in the classic stimuli with modulations of texture contrast. Whereas the classic (first-order) illusions exhibit changes in lightness or darkness near boundaries, the second-order stimuli exhibit analogous perceptual effects that are increases or decreases in apparent texture contrast with no concomitant change in apparent brightness. The magnitudes of the second-order texture-contrast changes are comparable to brightness changes in the classic first-order illusions. These results indicate that second-order (texture) illusions involve spatial interactions that are remarkably similar to those in first-order (luminance) processing.

Keywords:   luminance, contrast, first-order processing, second-order processing, Mach bands, Chevreul illusion, Craik-O’Brien-Cornsweet illusion

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