According to the Wiley Online Dictionary, it is:
"Motion perception is important for figure–ground segregation, three-dimensional vision, and visual guidance of action. Specialized brain cells detect image motion. Adaptation in these cells leads to illusory motion, such as the motion after-effect."
I have no idea what that's supposed to mean.
SO this is how I look at it:
Imagine you are looking at an optical illusion, or just look at the one below. It is one of those that you know it is not moving, because it is just a picture, but yet it appears to be moving and it could even give you a headache.
By detecting changes in small and large objects, or a change in size of objects, our brain automatically believes it is motion.
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