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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 Graph-Paper Effect

The Graph-Paper Effect

A Moving, Illusory, Stereoscopic Texture

(p.733) Chapter 107 The Graph-Paper Effect
The Oxford Compendium of Visual Illusions

Mark Georgeson

Oxford University Press

Most visual illusions involve distorted or altered perception of objects or events or misinterpretation of image information. The discrepancy between what we experience and what is physically present in the world or in the retinal image can be large, surprising, and dramatic. It is much rarer to see things that simply are not there at all. Repetitive stimuli, such as grating patterns or flickering lights, can induce perception of a range of illusory geometric patterns, forms, and movements—during or after exposure to the inducing stimulus. This chapter describes one such illusory phenomenon—the graph-paper effect—a striking illusion of moving, oriented lines and edges; links it to a family of related effects; and offers a general theory for these effects in terms of neural inhibition and disinhibition at the level of the visual cortex.

Keywords:   illusory geometric patterns, flickering light, grating, plaid, graph-paper effect, visual cortex

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