align="center">Lady Macbeth Not Alone in Her Quest for Spotlessness
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Liars, cheats, philanderers(1) and murderers are not renowned for exquisite(2) personal hygiene(3), but then no one has studied their showering habits.
They may scrub extra hard after a con(4) job, use $40 hyacinth shampoo after a secret tryst or book a weekend at a spa after a particularly ugly hit(5). They are human beings, after all, and if a study published in the journal Science is any guide, they feel a strong urge to wash their hands literally(6) after a despicable act in an unconscious effort to ease their consciences.
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And it works, at least for minor guilt stains(7). People who washed their hands after contemplating an unethical act were less troubled by their thoughts than those who didn't, the study found.
The researchers at the University of Toronto and Northwestern University call this urge to clean up the "Macbeth effect," after the scene in Shakespeare's tragedy in which Lady Macbeth moans, "Out, *ed spot(8)! Out, I say!" after bloodying her hands when her husband, at her urging, murders King Duncan.
In one of several experiments among Northwestern undergraduates, the researchers had one group of students recall an unethical act from their past, like betraying a friend, and another group reflect on an ethical deed, like returning lost money. Afterward, the students had their choice of a gift, either a pencil or an antiseptic(9) wipe. Those who had reflected on a shameful act were twice as likely as the others to take the wipe.
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In another experiment, the researchers found that students who had been contemplating an unethical deed rated the value of cleaning products significantly higher than peers who had been thinking about an ethical act.
Psychologists have known for years that when people betray their values, they feel a need to compensate. Christians who have read a blasphemous story about Jesus express a desire to go to church more frequently. "It's sometimes called symbolic cleansing, or moral cleansing, and it's an attempt to repair moral identity," said Dr. Philip Tetlock, a professor of organizational behavior at the University of California, Berkeley.
Sure enough, researchers found that students who had been thinking about past sins were very likely to agree to volunteer their time to help with a graduate school project unless they had been allowed to wash their hands, which cut their willingness to volunteerroughly in half.