Jim, 
    This top display is usually a circle divided in half with half being black and the 
other side with black arcs is commonly known as Benham's top... Just about any 
introductory Sensation & Perception text will have a demonstration box and explanation 
of this effect Coren, Ward, & Enns p. 144, Matlin p. 241, Shiffman p. 135.  Hope this 
helps.  
               Rene Verry, Millikin University
               [EMAIL PROTECTED]    

>>> Jim Matiya <[EMAIL PROTECTED]> 11/12 7:31 PM >>>
Hi topsters,
A  student question.  A disk that is black and white is spinning.
Depending on the speed, the disk will take on different colors such as
blue, red, and green?
Thanks in advance.
jim

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