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This is Scientific American 60-Second Mind, I'm Christie Nicholson. Got a minute?

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A lot of people just don't feel quite human without that morning cup of coffee.

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Now a study finds that the enhanced sense of well-being that caffeine can cause is reflected in our perception of words.

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Specifically, caffeine increases the ability to recognize words associated with positive thoughts,

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but doesn't provide the same boost for words with negative or even neutral associations.

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The research is in the journal PLoS One.

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Scientists assigned 66 subjects to one of two groups.

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Half got a 200 mg caffeine tablet, a dose equal to almost three cups of coffee.

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The other half received a sugar tablet.

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Thirty minutes later the volunteers were shown strings of letters, and had to decide as fast as they could if a string formed a word or was just gibberish.

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The volunteers recognized words with positive associations much faster than either negative or neutral words.

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Other studies have shown that positive words tend to be recognized more quickly,

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but the caffeine increases the gap.

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So next time you wake up with a grumpy sweetheart, your compliments might be appreciated more if they have a cup of coffee.

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Thanks for the minute, for Scientific American 60-Second Mind. I'm Christie Nicholson.

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