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to Dual N-Back, Brain Training & Intelligence
I know its not scientific but never replace the colored squares w/ porn.
I remembered that I did this in college about 7 years ago.
It was horrendous since I might be driving and I would happen to notice a building and then seconds later I would see in my minds eye the building in a very distracting way. The way I described it was a grabbed attention kind of way such as when you are in classroom and then someone opens the door causing everyone to look involuntarily. I stopped so the effects have gone away.