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1 results

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

  • Stephen L. Mills, Harry G. Sperling
  • Journal:
    Visual Neuroscience / Volume 5 / Issue 3 / September 1990
    Published online by Cambridge University Press:
    02 June 2009, pp. 217-221

  • 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.