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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 Freezing Rotation Illusion

The Freezing Rotation Illusion

(p.516) Chapter 70 The Freezing Rotation Illusion
The Oxford Compendium of Visual Illusions

Erika N. Lorincz

Max R. Dürsteler

Oxford University Press

A continuously rotating central texture (center) is presented together with a patterned surround oscillating back and forth. Generally, rotation of the surround induces misperceptions of the center’s angular velocity, which are known as induced rotational motion: a physically rotating center is perceived as turning faster when counterrotating with its surround and turning slower when co-rotating. However, during co-rotation, additional velocity misperceptions are observed: (a) a percept of motionless center (freezing rotation illusion) arises when the average angular velocity of the surround is fixed to a much higher value than that of the center and the appropriate oscillation frequency is set, and (b) a percept of the center sticking to its surround (rotational motion capture) arises when the average angular velocity of the surround is lower than the center velocity but higher than a given fraction of it.

Keywords:   freezing rotation illusion, motion capture, illusion, rotation, rotational motion

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