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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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Structure of Receptive Field Centers of Midget Retinal Ganglion Cells

Structure of Receptive Field Centers of Midget Retinal Ganglion Cells

Chapter:
(p.63) Chapter 7 Structure of Receptive Field Centers of Midget Retinal Ganglion Cells
Source:
Normal and Defective Colour Vision
Author(s):

Barry B. Lee

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198525301.003.0007

This chapter discusses factors influencing measurement of midget ganglion cell receptive field centres and relevant recent physiological evidence. Receptive field centre size of midget ganglion cells is much larger than the aperture of a single cone. This is partly due to the effects of optical blur. The cone-specific midget anatomy may not have evolved to achieve small centre size — since this would be lost by optical blurring anyway — but to help provide cone specificity. On the other hand recent physiological data suggest that the centre structure of midget ganglion cells may derive from more than one cone even in central retina, and that cone-specific mechanisms exist that contribute to centre structure. It appears that the centre structure of these cells is more complex than anticipated from the anatomy.

Keywords:   midget retinal ganglion cells, receptive field centres, colour vision, optical blur

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