Tom Allaway wrote:
In a class discussion of the phi phenomenon the other day, the talk drifted around to stroboscopic phenomena, and the "wagon-wheels-turning-backward" illusion that you get with films or TV. I explained this briefly, but several of my students said that it didn't depend on a flashing or intermittent source of illumination, as they frequently saw this effect in broad daylight, on the wheels of moving cars (especially those with wire wheels). I told them I didn't understand how that could be.
Can you get this illusion under continuous illumination? How?
Purves, Paydarfar, & Andrews (1996) describe cases of the wagon wheel illusion under continuous light. Here is a link to the paper.
http://www.pnas.org/cgi/reprint/93/8/3693.pdf
Their explanation is that the occurrence of the effect under continuous light indicates that we process motion in episodes.
Ken --------------------------------------------------------------- Kenneth M. Steele, Ph.D. [EMAIL PROTECTED] Professor Department of Psychology http://www.psych.appstate.edu Appalachian State University Boone, NC 28608 USA ---------------------------------------------------------------
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