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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

The Neural Circuit Providing Input to Midget Ganglion Cells

The Neural Circuit Providing Input to Midget Ganglion Cells

(p.71) Chapter 8 The Neural Circuit Providing Input to Midget Ganglion Cells
Normal and Defective Colour Vision

David W Marshak

Oxford University Press

This chapter proposes a neural circuit providing input to a central midget ganglion cell. The narrow field of amacrine cells are unselective in their contacts with bipolar cells, but because their dendritic arbors are small, their responses tend to be biased toward L or M cones, the same type that provides input to most of the nearby midget bipolar cells. The narrow field amacrine cells make inhibitory synapses onto wide field amacrine cells. The wide field amacrine cells inhibit the midget ganglion cells and midget bipolar cells, and they provide the classical, spatially antagonistic surround, as originally proposed by Dowling and Boycott (1996). Because the wide field amacrine cells have much larger dendritic trees, their input reflects the key ratio of L and M cones to the entire region of the retina.

Keywords:   neural circuits, midget ganglion cells, amacrine cells, retina

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