I think that Jean is getting some good input about the "apparition."
It's an afterimage just like many other afterimages that people
experience. And, yes, with opponent processing, the afterimage of red
will be green (and vice versa), blue will be yellow (and vice versa),
and white will be black (and vice versa). However, the McCullough
Effect is evidence that those pesky afterimages may not be have such a
low-level or "physical" explanation.
Hugh
------------------------------------------------
Hugh J. Foley
Professor
Department of Psychology
Skidmore College
Saratoga Springs, NY 12866
518-580-5308
http://www.skidmore.edu/~hfoley
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