In rock-paper-scissors, you’re in a battle to resist the impulse to copy your opponent

So says a scientist: When playing rock-paper-scissors, you respond to unconscious stimuli from your opponent, and there’s some part of you that’s trying to copy what you think the other person is about to do.

Cook found that the players drew with each other more often when one of them could see (36.3% of the matches) than when both were blindfolded (33.3% of them). The latter figure was exactly the proportion of draws you’d expect if the players were choosing randomly; the former was significantly higher than chance.

From Not Exactly Rocket Science.

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