Cone antagonism along visual pathways of red/green dichromats.

We have measured thresholds for bichromatic test-mixtures in red/green dichromats. Our results provide strong evidence for cone-antagonistic coding along the dichromats' detecting pathways. The threshold behavior of the isolated dichromatic pathways is consistent with that predicted by Opponent Colors Theory. We compare these threshold data with the dichromats' judgments of "blue/yellow" hue equilibria, which we obtained in supra-threshold color-cancellation experiments. The results are consistent with the hypothesis that both sets of data are mediated by the same dichromatic cone antagonistic pathway.