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Red/green opponency in the rhesus macaque ERG spectral sensitivity is reduced by bicuculline

Published online by Cambridge University Press:  02 June 2009

Stephen L. Mills  and
Harry G. Sperling
Stephen L. Mills
Affiliation:
Sensory Sciences Center, Graduate School of Biomedical Sciences, University of Texas Health Science Center at Houston
Harry G. Sperling
Affiliation:
Sensory Sciences Center, Graduate School of Biomedical Sciences, University of Texas Health Science Center at Houston
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Abstract

Spectral-sensitivity curves were derived from the a−, b−, and d−waves of rhesus monkey ERGs after injection of bicuculline, strychnine, or no drug. Without drug injection, the a− and d−wave curves were well-fit by an additive model of weighted photoreceptor absorption spectra, while the b−wave curve requires inhibitory terms to produce an adequate fit. Bicuculline, but not strychnine, reduced the weight assigned to the inhibitory terms in a dose-dependent fashion, to the point that no inhibition was evident. The results suggest that GABAergic synapses are required for the expression of red/green color opponency in primate bipolar cells.

Keywords

BicucullineRhesus macaquePhotoreceptor absorption spectraERG spectral sensitivityBipolar cells
Type
Research Article
Information
Visual Neuroscience , Volume 5 , Issue 3 , September 1990 , pp. 217 - 221
Copyright
Copyright © Cambridge University Press 1990

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