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***SPOILER ALERT. DON'T READ BEFORE DOING EXPERIMENT***
The afterimage is something I'm interested in, too. It seems to interact in interesting ways with eye-movements, but I've never figured out how. I think it might be related to 'iconic' or 'sensory' memory. Unfortunately, that's not my specialty.
As you say, the 1-second delay is supposed to be long enough to void any effects of the afterimage.
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Please try my web-based experiments