They noticed, among other things, that the timing of the flashes was important in determining whether or not motion was seen. For intermediate ISIs the first dot seems to turn off, move through the space between the dots and appear at the position of the second dot. The farther apart the stimuli were the longer the ISI needed to be for a good motion percept. The relationship between spatial separation and ISI threshold is consistent with a variety of theories that hypothesize that the visual system builds a motion percept. This experiment allows you to see apparent motion in one of its simplest forms and to demonstrate Korte's law for yourself.
Apparent motion is the basis of movement in all television, movies, and computer animation.
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