Red - Green Opponent Spectral Sensitivity: Disparity Between Cancellation and Direct Matching Methods

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Science  29 Sep 1978:
Vol. 201, Issue 4362, pp. 1221-1223
DOI: 10.1126/science.201.4362.1221


The spectral sensitivity at the opponent stage of the visual system is traditionally measured by a hue-cancellation procedure. Comparison with a direct hue-matching method shows that cancellation overestimates short-wavelength sensitivity by as much as a factor of 30. The observation implies that different mechanisms control the perception of short-wavelength and long-wavelength redness.