A new study examined the link between support for a religion and a willingness to inflict punishment.
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The second player then had the option of punishing the first one by deducting from their reward - but punishing meant the punisher lost a reward unit for each three units they deducted from their partner.
Before deciding on the punishment, the second player was subliminally shown a group of words. These either related to religion - like "divine", "holy", "pious" and "religious" - to secular punishment, or were neutral words like "tractor".
After the game, all players were asked if they had donated money to a religious organisation in the previous year. The team found that those who had donated - about 15 per cent of participants - exacted the most severe punishments, but only after they had been shown the subliminal religious cues.
"We think that the cues give them a reminder they are being watched. To please the supernatural agent they worship, they exact higher punishments. The other possibility is that the cued words awakened the concepts of appropriate punishment in their minds," New Scientist quoted psychologist Ryan McKay of Royal Holloway University of London, as saying.
McKay pointed out that being religious can be costly in various ways: donating money, suffering painful rites and avoiding pleasures, for example. So the team wondered how religion survived, despite these apparent costs.
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The study appears in Proceedings of the Royal Society B.
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