motion perception

describe four different situations that can result in motion perception. Which of these situations involve real motion and which involve illusions of motion? Finally, how can we explain illusory motion? 

Your essays should be 1-2 pages long. They should be well written in your own words and they should be well researched. As always, include a list of references at the end of the paper in which you list (APA style) the publications you cite in the essay.