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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 Freezing Rotation Illusion

The Freezing Rotation Illusion

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

Erika N. Lorincz

Max R. Dürsteler

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0070

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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