Here's the key: Some shit is serious and I am serious when I talk about it because it requires the ability to be serious.
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Several interesting things happened. First, the caffeine enhanced performance on the cognitive tasks - it wasn't just a placebo effect.
Second, there was a small effect of expectancy on task performance in the placebo group - but it worked in reverse. People who were told that the coffee would make them do worse actually did better than those who expected the coffee to help them. Presumably, this is because they put in extra effort to try to overcome the supposedly negative effects.
Finally, no-one who got the decaf noticed that it didn't actually contain caffeine, and the volunteer's ratings of their alertness and mood didn't differ between the caffeine and placebo groups. So, this suggests that if you were to secretly replace someone's favorite blend with decaf, they wouldn't notice - although their performance would nevertheless decline.
Coffee
God, I love coffee.
Energy drinks and COFFEE (Image removed from quote.)
