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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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Geometric-Optical Illusions Under Isoluminance?

Geometric-Optical Illusions Under Isoluminance?

Chapter:
(p.206) Chapter 18 Geometric-Optical Illusions Under Isoluminance?
Source:
The Oxford Compendium of Visual Illusions
Author(s):

Kai Hamburger

Thorsten Hansen

Karl R. Gegenfurtner

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0018

This chapter briefly introduces nine classical geometric-optical illusions. These include the Delboeuf illusion, the Ebbinghaus illusion, the Judd illusion, the Müller-Lyer illusion, the Ponzo illusion, the vertical illusion, the Hering illusion, the Poggendorff illusion, and the Zoellner illusion. It then demonstrates that they persist under different luminance conditions and under isoluminance. The empirical findings show that our conscious percept is similarly affected by luminance conditions and isoluminance, suggesting that joint contour processing (chromatic and luminance) may extend well beyond early visual areas. The chapter further discusses these concepts in terms of the magnocellular system, the parvocellular system, and the koniocellular system.

Keywords:   geometric-optical illusions, isoluminance, luminance, magnocellular system, parvocellular system, koniocellular system

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