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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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Two Sinusoids

Two Sinusoids

6 – 1 Perceptions

(p.692) Chapter 100 Two Sinusoids
The Oxford Compendium of Visual Illusions

Jan Kremláček

Oxford University Press

Multiplication of a stationary and moving sinusoids create ambiguous stimulus that, when observed, can result in five alternating perceptions and another physically plausible but hardly traceable interpretation. The most astonishing about this illusion is that using single physical stimulus creates several vivid unambiguous perceptions that may intentionally or spontaneously alternate in observer’s mind. The illusion demonstrates the brain’s active role in acquiring and processing visual information and its ability to construct 3D objects from a 2D motion. To build such visual interpretations the brain exploits several mechanisms. In the presented illusion the most noticeable strategies are a kinetic depth perception and a perceptual rivalry.

Keywords:   illusion, perceptual rivalry, kinetic depth perception, perception, sinusoid

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