Final answer:
The phenomenon of apparent motion refers to the perception of motion when viewing two still images.
Step-by-step explanation:
The phenomenon of apparent motion refers to the perception of motion when viewing two still images. It is the perception of movement between separate images or stimuli that are presented in rapid succession. For example, when watching a movie, the individual frames are still images, but because they are shown quickly one after another, it creates the illusion of continuous motion.