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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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The Reversed Contrast Necker Cube

The Reversed Contrast Necker Cube

Chapter:
(p.349) Chapter 43 The Reversed Contrast Necker Cube
Source:
The Oxford Compendium of Visual Illusions
Author(s):

Alessandra Galmonte

Tiziano Agostini

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0043

Agostini and Galmonte reported a configuration showing that when grouping factors are optimized, a grey target totally surrounded by black appears darker than an equal grey target totally surrounded by white. This is called the simultaneous contrast. The theoretical assumption is that, when higher-level factors act simultaneously with lower-level factors, the former prevails over the latter. Specifically, it is assumed that the lightness induction produced by the global organization principle of perceptual belongingness prevails over retinal lateral inhibition. A reversed contrast Necker cube display with two middle grey dashed cubes is used to illustrate the effect. The first one had dark inducer corners and was placed on a light inducer background, and the second one, which had light inducer corners, was placed on a dark inducer background.lightness induction, grouping, perceptual belongingness, lateral inhibition, organization principles

Keywords:   lightness induction, grouping, perceptual belongingness, lateral inhibition, organization principles

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