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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 Occlusion, Configural Shape, and Shrinkage Illusions

The Occlusion, Configural Shape, and Shrinkage Illusions

(p.269) Chapter 29 The Occlusion, Configural Shape, and Shrinkage Illusions
The Oxford Compendium of Visual Illusions

Stephen E. Palmer

Karen B. Schloss

Oxford University Press

A suite of three related visual illusions of size and shape are described—the occlusion illusion (OI), configural shape illusion (CSI), and shrinkage illusion (SI)—along with the relations among them. All can be produced by simple geometric arrangements of two overlapping rectangular surfaces. They differ in the direction of their effects, however, with the OI and CSI making regions appear larger and the SI making them appear smaller. Evidence is also described suggesting that different mechanisms underlie them, with the OI caused by partial modal filling-in along an occluding edge and the CSI and SI by assimilation of edge positions to configually relevant borders.

Keywords:   visual illusion, shape illusion, occlusion illusion, configural shape illusion, shrinkage illusion, filling-in, assimilation

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