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The Neuropsychology of Vision$
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Manfred Fahle and Mark Greenlee

Print publication date: 2003

Print ISBN-13: 9780198505822

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780198505822.001.0001

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Colour vision and its disturbances after cortical lesions

Colour vision and its disturbances after cortical lesions

Chapter:
(p.259) Chapter 8 Colour vision and its disturbances after cortical lesions
Source:
The Neuropsychology of Vision
Author(s):

C.A. Heywood

A. Cowey

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198505822.003.0008

This chapter provides a discussion on colour vision and its disturbances after cortical lesions. It specifically describes that it is less clear whether colour constancy can be selectively impaired. It is shown that the orientation and direction selectivity of cells in the M-channel, along with their high luminance contrast gain, indicates that it plays a role in conveying motion and form information to visual areas in the parietal lobes. It is also noted that the loss of colour vision in achromatopsia can leave other wavelength-based processing intact. Moreover, the described studies demonstrate that wavelength variation in the visual scene can be used, not only to produce colour experience, but also to determine further attributes such as form and motion. It is stated that chromatic information plays a manifold role in vision.

Keywords:   colour, vision, cortical lesions, visual motion, achromatopsia

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