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Originally Posted by bobbyv
If you stare at a sharp black-and-white pattern for an extended picture of time, then stare at a blank wall, you will see the "negative" of the pattern you were originally staring at.
Green seems to be the "negative" of pink. When you stare at the center of the circle for a while, then look at another part of the screen, you will see a circle of green dots - this is the negative image of the pink dots.
When a pink dot turns off, you will see its negative image (green) shortly afterwards. As the pink dots sequentially turn off and on around the circle, you therefore see a green dot circulating.
I have no explanation for the pink dots disappearing ... maybe it is Visine ...
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This is a good explanation, as is the one following yours by Matt L. You know how they say the olfactory sense fatigues quickly and that's why people who stink or use too much perfume don't know it? I was thinking that maybe, well almost certainly, the optic nerves and muscles fatigue as well. So when you're looking at only pink, the not-pink receptor part is realtively fresh and in the absense of new stimulii might come to the fore briefly.
Could be that's why the pink disappear. The pink receptor synapses take a nap.