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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: 19 October 2021

Coding of Position of Achromatic and Chromatic Edges by Retinal Ganglion Cells

Coding of Position of Achromatic and Chromatic Edges by Retinal Ganglion Cells

Chapter:
(p.79) Chapter 9 Coding of Position of Achromatic and Chromatic Edges by Retinal Ganglion Cells
Source:
Normal and Defective Colour Vision
Author(s):

Hao Sun

Barry B. Lee

Lukas RÜttiger

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198525301.003.0009

This chapter examines how accurately ganglion cells carry positional information about chromatic and achromatic moving edges, and compares results with pathophysical thresholds to similar stimuli. Physiological data showed that spatial precision of magnocellular (MC)-cells' responses was determined solely by luminance contrast, but that of parvocellular (PC)-cells was dependent on chromatic contrast. Psychophysical vernier thresholds for edges of the same luminance, but different chromatic contrasts were similar when plotted as a function of luminance contrast, but were different when plotted in detection threshold units. Taken together, the physiological and psychophysical data suggest that positional information delivered by MC-cells is important for vernier performance.

Keywords:   ganglion cells, magnocellular cells, parvocellular cells, vernier performance, moving edges

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