A hue judged to contain no perceptual mixture of a specified opponent pair, such as a yellow judged neither reddish nor greenish. Its measured setting depends on observer and conditions and should not simply be identified with one retinal cardinal axis.
A yellow judged neither reddish nor greenish. A wavelength or matching setting can operationalize the judgment under controlled conditions; shifts in that setting do not by themselves identify the neural locus of a change.
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