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This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?

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A good "poker face" can hide the quality of your cards.

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But your arms might still be giving away your hands.

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That's the finding of a study to come out in the journal Psychological Science.

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Volunteers watched videos of the World Series of Poker.

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The videos were edited so the subjects saw one of three different views of the players:

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the poker players' entire bodies from the table up, or just the players' faces or just the players' arms pushing chips into the pot.

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"When participants were watching chips being pushed into the center of the table by the players,

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it was only then could they accurately perceive how good a hand was better than chance.

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They couldn't do it for the whole body and if anything they were worse from just watching the face."

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Michael Slepian, a psychology doctoral student at Stanford University, and a co-author of the study.

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No pros were among the video watchers.

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But there's some evidence that, as might be expected, they'd be even better at catching arm cues.

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"In one of our studies, the more participants were familiar with poker, even though they were all novices, the better they did."

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Steve Mirsky.

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