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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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Dynamic Illusory Size Contrast

Dynamic Illusory Size Contrast

Enhanced Relative Size Effects Due to Stimulus Motion

Chapter:
(p.258) Chapter 27 Dynamic Illusory Size Contrast
Source:
The Oxford Compendium of Visual Illusions
Author(s):

Ryan E. B. Mruczek

D. Blair Christopher

Lars Strother

Gideon P. Caplovitz

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0027

Static size contrast and assimilation illusions, such as the Ebbinghaus and Delboeuf illusions, show that the size of nearby objects in a scene can influence the perceived size of a central target. This chapter describes a dynamic variant of these classic size illusions, called the Dynamic Illusory Size-Contrast (DISC) effect. In the DISC effect, a surrounding stimulus that continuously changes size causes an illusory size change in a central target. The effect is dramatically enhanced in the presence of additional stimulus dynamics arising from eye movements or target motion. The chapter proposes that this surprisingly powerful effect of motion on perceived size depends on the degree of uncertainty inherent in the size of the retinal image of a moving object.

Keywords:   size contrast, Delboeuf, Ebbinghaus illusion, size illusion, motion, Dynamic Illusory Size-Contrast

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