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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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Blur Adaptation and Induction

Blur Adaptation and Induction

Chapter:
(p.756) Chapter 110 Blur Adaptation and Induction
Source:
The Oxford Compendium of Visual Illusions
Author(s):

Michael A. Webster

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0110

The image on the retina is always blurred because of optical aberrations of the eye. Yet typically the world does not “look” blurred, and although the acuity of the eye varies dramatically from the center of gaze to the periphery, the outside world generally “feels” focused throughout the visual field. This perception of focus is one of many illusions where the brain appears unaware of its own imperfections. The perceived focus of an image can be strongly biased by prior adaptation to a blurred or sharpened image or by simultaneous contrast from a blurred or sharpened surround. Adaptation to blur can selectively adjust to the patterns of blur introduced by different optical aberrations and may reflect adjustments that help compensate spatial perception for the optical and neural sensitivity limits of the visual system.

Keywords:   blur, adaptation, induction, contrast, spatial perception, visual system

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