Discussion
The phi-phenomenon, stroboscopic motion, induced motion and autokinetic motion are all
Answer: B
The phi phenomenon (two lights switched on in turn seem to move), stroboscopic motion (as in a film), induced motion (a stationary object seems to move because of its surroundings) and the autokinetic effect (a fixed spot of light in the dark seems to wander) are all examples of apparent motion, where no physical movement happens but it is perceived. Pictorial cues are the monocular depth cues in a picture, and double images and non-verbal cues are unrelated. In each case there is a stimulus that gives the illusion of motion, so the movement perceived is apparent, as against real motion where an object actually changes its position in space. The answer is apparent motion.
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