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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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Chromatic Assimilation: Evidence for a Neural Mechanism

Chromatic Assimilation: Evidence for a Neural Mechanism

Chapter:
(p.114) Chapter 12 Chromatic Assimilation: Evidence for a Neural Mechanism
Source:
Normal and Defective Colour Vision
Author(s):

Steven K. Shevell

Dingcai Cao

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198525301.003.0012

Chromatic induction refers to the shift in colour appearance caused by nearby light. Most research on chromatic induction has focused on colour contrast, which is a shift in appearance away from the colour of the nearby light. Most studies of chromatic assimilation suggest that neural factors contribute to it. The nature of neural mechanisms, however, is often vague or untested. This chapter has two aims. First, a new stimulus is introduced to minimize the influence of prereceptoral factors. Most previous studies of assimilation used contextual light covering half or more of the whole stimulus area. Here, light is induced in various conditions that covers just 9% to 37% of the whole area. Measurements show that chromatic assimilation from this contextual light cannot be explained by prereceptoral factors. Second, the proportion of the whole area covered by inducing light was varied systematically to test for neural summation over the stimulus area. The measurements are generally consistent with neural summation.

Keywords:   chromatic induction, chromatic assimilation, neural mechanism, colour appearance

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