So, here's a site that illustrates and discusses the McCullough Effect:
http://www.cheswick.com/ches/me/index.html
Celeste McCullough (was she at Oberlin??) published an article in 1965 that described the effect. The effect is not explainable in the "usual" low-level afterimage fashion, which (I think) then calls into question all low-level explanations of afterimages. If you think only of the two inducing images, one might predict some sort of plaid afterimage, but the test grid shows that we organize the afterimage spatially. That's perplexing enough, but the afterimage can persist for so long a duration that a simple "rebound" explanation doesn't seem plausible.
Hugh
On Sunday, November 2, 2003, at 09:55 PM, Annette Taylor, Ph. D. wrote:
More on the McCullough Effect please!
Annete
Quoting Hugh Foley <[EMAIL PROTECTED]>:
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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Annette Kujawski Taylor, Ph. D. Department of Psychology University of San Diego 5998 Alcala Park San Diego, CA 92110 [EMAIL PROTECTED]
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------------------------------------------------ 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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