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Originally Posted by JinnKai
Kinda what NG said:
When you stare at the purple dots, they saturate your red and blue sensors. When it gets rid of the purple dot, your cones have to adjust back to the true color, but only your green sensors are still unsaturated. So you see green until it adjusts and combines back in blue and red to get grey. The green "dot" is not actually moving, they're just removing the purple dots in sequence and your rods/cones get to adjust over and over.
The second part where the magenta dissapears completely is our brain saying "WTF?" and getting rid of the random noise. It's called the Troxler effect..
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Thanks for the explanation JinnKai! It makes sense to me now (or at least, more than it did before). It's interesting that the 'purple' sensors are both saturating and shutting off at the same time, and then unsaturating and turning on because of the movement and change of color.
But why is it that only the pink dots disappear, and not the black text above and below as well? I'm guessing only the color sensors (cones?) are affected, and since the contrast between pink and grey are the same, pink becomes grey when the color shuts off.