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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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Geometrical Errors Are the Cost of Maintaining the Luminance Contrast Polarity

Geometrical Errors Are the Cost of Maintaining the Luminance Contrast Polarity

Chapter:
(p.290) Chapter 32 Geometrical Errors Are the Cost of Maintaining the Luminance Contrast Polarity
Source:
The Oxford Compendium of Visual Illusions
Author(s):

Sergio Roncato

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0032

The visual completion is the result of the integration of fragmented contours. The contrast polarity (or contrast sign) may affect this interpolation by strengthening the completion in a direction where the contrast polarity is preserved. This chapter illustrates some manifestations of these phenomena: the alteration of the alignment of the visual units and the illusory tilt of more complex visual organization. The occurrence of basic distorting effects underlying classic illusions—such as the Frazer illusion—is discussed. It is noted that the role of the contrast polarity rule in representing a “preferential” rule does not preclude other possibilities, such as edges completion, although it renders the contour detectable to a lesser degree.

Keywords:   contour, contrast polarity, illusory tilt, visual completion, Frazer illusion

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