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The feedforward component in depolarizing red responses of R/G horizontal cells in carp retina

Published online by Cambridge University Press:  09 April 2001

JIAN-FENG HU  and
PEI-JI LIANG
JIAN-FENG HU
Affiliation:
Key Laboratory of Neurobiology, Shanghai Institute of Physiology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai 200031, China
PEI-JI LIANG
Affiliation:
Key Laboratory of Neurobiology, Shanghai Institute of Physiology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai 200031, China
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Abstract

Light responses of R/G chromaticity-type horizontal cells (R/G HCs) and luminosity-type horizontal cells (LHCs) were intracellularly recorded in isolated superfused carp retina, and the response dynamics analyzed. The results revealed that (1) No significant difference in delay was detected between R/G HC red and green responses; (2) The rising speed was quicker for R/G HC depolarizing red responses compared to that of its hyperpolarizing green responses; and (3) Dynamic characteristics of R/G HC red responses and its changes caused by green background illumination did not follow that of LHC red response. All these results suggest that the depolarizing response of the R/G HCs cannot be entirely mediated by the negative feedback pathway from LHCs onto cones. A direct inhibitory input from red cones to R/G HCs may exist.

Keywords

R/G horizontal cell (R/G HC)Carp retinaColor opponencyDynamic characteristics
Type
Research Article
Information
Visual Neuroscience , Volume 17 , Issue 6 , November 2000 , pp. 919 - 924
Copyright
2000 Cambridge University Press

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