I haven't found any other psychological term for it, but it is found in
popular books on perceptual illusions. I suppose, as one of many ways to
illustrate persistence of vision, it hasn't received much research
attention. I was hoping someone in the field of S & P might actually have
some information. My search of Psych Info hasn't yielded anything
particular on this one. I probably encountered it in an old instructor's
manual from a Gen Psych text. I mention in class that invariably the
illusion of a third coin appears below the two being rubbed together. We
played around with that, and speculated that it might be due to the uneven
timing of the finger movement and that spatial orientation may play a role
as this imbalanced displacement of the illusory coin is more balanced when
the coins move horizontally than vertically. Oh well, maybe I will get some
senior research students to work on this! Next to my psychic demos, or me
whirling around to demonstrate vestibular nystagmus, it's a useful demo of
persistence of vision. Gary Peterson
Gerald (Gary) L. Peterson, Ph.D.
Professor, Department of Psychology
Saginaw Valley State University
University Center, MI 48710
[EMAIL PROTECTED]
1-517-790-4491
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