Scientists spent a morning training 61 people in motor, perceptual and verbal tasks: tapping a keyboard in a specific sequence, discriminating between shapes on a computer screen and memorizing a list of words. Then the scientists randomly divided the subjects into three groups. The first took a nap from 1 to 3 p.m. At 3, the second group took a 200-milligram caffeine pill, and the third took a placebo. The subjects repeated the tasks they had been taught earlier and were scored by researchers who did not know which group they were in. More...
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