Wavelength discrimination with a chromatically alternating stimulus

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Abstract
Wavelength‐discrimination functions were measured with monochromatic stimuli of 410–660 nm at equal luminance of 220 td, presented as temporally alternating fields at the frequencies of 0.5–12.0 Hz. When the alternation frequency was less than 1.0 Hz, wavelength discrimination was the same at all test wavelengths as that obtained by the classical bipartite‐field method. As the frequency was raised, the discrimination thresholds increased more near 450–470 nm than at other wavelengths, and tritanopic‐like wavelength‐discrimination functions were obtained at frequencies higher than 4.0 Hz. Our results may be explained by the notion that the blue‐cone mechanism has poorer temporal resolution than the red‐and green‐cone mechanisms.

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