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A generally known method for the dynamic investigation of any linear system is recalled to mind. Applied to the visual organ with sinusoidally modulated light, the dynamic nature of the system fovea→brightness perception is embodied in attenuation characteristics, by plotting the ratio output amplitude over input amplitude against frequency at constant mean luminance. This manner of investigation, first applied in previous papers with white light, is expanded over a greater part of the range of cone vision and is continued with colored light. The existing theories on flicker fusion provide no explanation for the shape of the attenuation characteristics obtained with the experiments and calculated from investigations of other authors.
H. de Lange Dzn (Sat,) studied this question.