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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 Aperture Problem

The Aperture Problem

Illusions Arising During the Integration and Segmentation of Motion Within and Across Apertures

Chapter:
(p.556) Chapter 76 The Aperture Problem
Source:
The Oxford Compendium of Visual Illusions
Author(s):

Maggie Shiffrar

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0076

The accurate visual perception of an object’s motion requires the simultaneous integration of motion information arising from that object along with the segmentation of motion information from other objects. When moving objects are seen through apertures, or viewing windows, the resultant illusions highlight some of the challenges that the visual system faces as it balances motion segmentation with motion integration. One example is the barber pole Illusion, in which lines appear to translate orthogonally to their true direction of emotion. Another is the illusory perception of incoherence when simple rectilinear objects translate or rotate behind disconnected apertures. Studies of these illusions suggest that visual motion processes frequently rely on simple form cues.

Keywords:   motion perception, aperture problem, barber pole illusion, integration, segmentation, form

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