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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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Second-Order Reversed Phi

Second-Order Reversed Phi

Chapter:
(p.522) Chapter 71 Second-Order Reversed Phi
Source:
The Oxford Compendium of Visual Illusions
Author(s):

Zhong-Lin Lu

George Sperling

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0071

A second-order reversed-phi stimulus is composed of moving features (areas filled with texture) whose overall amount of texture-contrast is reversed between successive frames. In peripheral vision, the stimulus is perceived as moving in the reversed direction (opposite to the feature displacement). In central vision, it is perceived in the forward direction at low temporal frequencies but in the reversed direction at high temporal frequencies. Moving the observer away from the displays has the same effect as changing from central to periphery vision: reversed motion becomes more dominant. The illusion demonstrates the different properties of the second- and third-order motion systems.

Keywords:   first-order motion, second-order motion, third-order motion, phi, reversed phi, motion systems

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