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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

The Bar-Cross-Ellipse Illusion

The Bar-Cross-Ellipse Illusion

(p.165) Chapter 12 The Bar-Cross-Ellipse Illusion
The Oxford Compendium of Visual Illusions

Gideon P. Caplovitz

Alex Boswell

Kyle Killebrew

Oxford University Press

This chapter describes a multistable stimulus that reveals the complexity of visual processing that underlies the determination of an object’s form and motion. The stimulus is constructed by placing an ellipse on a uniform background and then partially occluding it with four squares, each with the same color as the background. When the ellipse is made to rotate, it can be perceived in any of four distinct ways, and, over time, the percept will switch between them. Each percept corresponds to a distinct figure-ground segmentation that is determined on the basis of contour ownership and how different sources of motion information are assigned to contours and integrated over space and time.

Keywords:   multistable, form, motion, contour, motion information, ellipse

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