Many experiments have now shown that synchronous movement has exactly these effects. In one study, small groups of college students were given headphones to wear and were asked to hold up a beer mug and sway along with the music that they heard. Half of the groups swayed in perfect harmony (because they were listening to the same music at the same time). Half were out of sync (because the music was delivered to their headphones that way). All groups then played a trust game in which a group makes the most money if they all cooperate across many rounds, but any one of them could earn more money
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