"It also appears to be light or contrast dependent. Try viewing it in a dimly lit room then try again in a well lighted one. In the dimly lit room it will appear much more "active" in its movements, and in the bright one it may seem not to move at all!"
I have the same experience with dim vs.
bright lighting. Would the fact that monitors 'refresh' the images on
screen affect this illusion (esp. when compared to overheads and the
like)?
Ruth Frickle
Department of Psychology
Highline Community College
2400 S. 240th St.
P.O. Box 98000
Des Moines, WA
98198-9800
(206) 878-3710 ext. 3111
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