Abstract

Spectral sensitivities were measured by a method of constant CFF under adaptation to high-luminance chromatic fields and under dark adaptation. Adaptation to yellow yielded a narrow curve of spectral sensitivity whose maximum was at about 440 nm (similar to Stiles’s π1) when the CFF was low (18 Hz), but yielded a broader spectral sensitivity, maximum 540–560 nm, when the CFF was high (30 Hz). Adaptation to red and green yielded spectral sensitivities that were similar in shape to those of π4 and π5, respectively. Measurements obtained under dark adaptation at CFF’s of 25 and 30 Hz were consistent with the hypothesis that flicker is detected by whichever component (e.g., π4 or π5) is the more sensitive; spectral sensitivity corresponded to the outer envelope of the two components. When the CFF was 40 Hz, dark-adapted spectral sensitivity was narrower in shape than either π4 or π5. These measurements at high CFF are reasonably consistent with the hypothesis that flicker is detected when the thresholds of both components are surpassed; spectral sensitivity corresponded to the inner envelope of the two components.

© 1973 Optical Society of America

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