I think this illusion relies heavily on the high-frequency transitions between adjacent segments in the circles. If you "filter out" the high-frequency info. (by, say, squinting) much of the movement disappears. Perhaps those with less than perfect vision will have a harder time seeing the illusory motion because of this?
Well, I tried it w/o my glasses (and I have an astigmatism in one eye and 20/200 vision in the other eye) and still saw the illusion. However, when I closed one eye and looked at it, the illusion went away. Anyone else notice that it seems to be binocular? Or is it just me?
Deb
Dr. Deborah S. Briihl Dept. of Psychology and Counseling Valdosta State University Valdosta, GA 31698 (229) 333-5994 [EMAIL PROTECTED] http://chiron.valdosta.edu/dbriihl/
Well I know these voices must be my soul... Rhyme and Reason - DMB
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