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Normal and Defective Colour Vision$
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John D. Mollon, Joel Pokorny, and Ken Knoblauch

Print publication date: 2003

Print ISBN-13: 9780198525301

Published to Oxford Scholarship Online: April 2010

DOI: 10.1093/acprof:oso/9780198525301.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 20 October 2021

Contribution of Achromatic and Chromatic Contrast Signals to Fechner–Benham Subjective Colours

Contribution of Achromatic and Chromatic Contrast Signals to Fechner–Benham Subjective Colours

Chapter:
(p.145) Chapter 16 Contribution of Achromatic and Chromatic Contrast Signals to Fechner–Benham Subjective Colours
Source:
Normal and Defective Colour Vision
Author(s):

J. Le Rohellec

H. Brettel

F. Viénot

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198525301.003.0016

This chapter describes an experiment aimed at examining the respective contribution of achromatic contrast and isoluminant chromatic contrasts for generating subjective colours. It compares the efficiency of cone contrasts that are manipulated in an additive mode or in an antagonistic mode to differentiate subjective colours produced by different spatio-temporal stimuli. The results demonstrate the prevalence of the achromatic contrast to elicit Benham subjective colours. It seems that isoluminant chromatic contrast needs to be boosted to a very high value to produce subjective colours. The findings confirm that S-cone signals alone are inefficient to generate Benham colours.

Keywords:   achromatic contrast, chromatic contrast, subjective colour, cone contrast, Benham colours

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