For the purpose of display design, it is important to know the Characteristics of the human observers viewing the displays. As one such characteristic, the temporal response of human vision was measured under unadapted conditions from absolute threshold to the highest feasible intensities, under controlled conditions which minimized flicker adaptation. Flicker was visible to more than 100 Hz at high intensities and conformed to the Ferry-Porter law over a 5-6 decade range. Flicker sensitivity increased about twice as fast in the periphery as the central foveola. The simple relation of the Ferry-Porter law can thus be used to characterize the human temporal response for almost any display requirements.