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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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Grating Induction

Grating Induction

(p.415) Chapter 55 Grating Induction
The Oxford Compendium of Visual Illusions

Mark E. McCourt

Barbara Blakeslee

Oxford University Press

Grating induction is a brightness/lightness illusion in which a sinewave luminance grating induces the appearance of a counterphase sinusoidal grating in a homogeneous test field oriented orthogonally to the inducing grating. Induction is greatest at low spatial and temporal frequencies and declines with increasing frequency in both dimensions. Induction magnitude also declines with increasing test field height and scales as the product of inducing grating spatial frequency (c/d) and test field height. These properties of grating induction are difficult to explain using nonfiltering-based models but are readily accounted for by multiscale spatial filtering and lend support to such models of brightness/lightness induction.

Keywords:   grating induction, brightness contrast, brightness/lightness induction, multiscale spatial filtering, spatial frequency, temporal frequency

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