motion perception...flashes of a stationary light is less than this visual-persistence time, the flicker will appear to fuse into a continuous light. The flicker frequency at which this occurs is called the perceiver’s flicker-fusion frequency (or critical flicker frequency) and represents the temporal resolving power of his visual system at the time. Another process on which apparent movement depends is a tendency......of black followed by white is aroused; as the speed increases the sensation becomes one of flicker— i.e., rapid fluctuations in brightness; finally, at a certain speed, called the critical fusion frequency, the sensation becomes continuous and the subject is unaware of the alterations in the illumination of the screen.
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