Abstract
The luminance at which the flicker of a white test light was perceived was determined as a function of the phase angle between the light and pulsing white, green, yellow, red, and blue surround fields which were equated for brightness. It was found that the luminance thresholds for perceived flicker increased when the test light and the surround were in phase. The amount of increase varied as a function of the color of the surround, being a maximum for white, less for green, still less for yellow, and a minimum for red and blue. No differences in absolute threshold were found as a function of phase for 1-sec observation periods of the test flash. The results are discussed with reference to the differences in amplitude as a function of the surround wavelength as well as to submaxima found in the luminance functions.
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