Poker pros’ arms betray their hands

No bluff: In high-stakes matches, a poker face may not be good enough. Players may have to develop “poker arms” as well.

When shown two-second video clips of the arms and hands of top players making bets in the World Series of Poker, college students did well at judging who was playing a strong hand and who wasn’t, say psychology graduate student Michael Slepian of Tufts University in Medford, Mass.,