Disgust helps protect people from dangerous or questionable situations. The disgust you feel when looking at rotten food, for example, prevents you from eating a potentially toxic meal. The study’s authors speculated that disgust might make people more self-interested, decreasing their willingness to help or notice others. After all, disgust can be an overpowering emotion that provokes an immediate desire to escape the disgusting situation.
To test their hypothesis about how disgust affects behavior, researchers induced disgust in nearly 600 participants. In one trial, participants contemplated “disgusting” products such as cat litter, incontinence products, and anti-diarrhea medication. Researchers asked a second group to write an essay about their most disgusting memory, and a third group watched a toilet scene from the movie Trainspotting.
After inducing feelings of disgust, researchers administered a series of tests to evaluate participants’ willingness to lie and cheat for financial benefit. Those who reported higher levels of disgust were also more likely to lie, cheat, and engage in other self-centered behaviors.
In a second trial, researchers induced a state of disgust, then asked participants to contemplate various household cleaners. Participants who evaluated the cleaners were no more likely to engage in dishonest behavior than those who did not experience disgust.
The study’s authors believe their results point to the value of a clean environment. When people feel disgusted by their surroundings, they’re less likely to behave ethically. But when that disgust is “cleaned”—either metaphorically, by thinking about cleaning products, or literally, by removing the source of the disgust—people may behave more ethically.
A 2008 sociological experiment made a similar observation after evaluating the effects of urban disorder, such as litter and graffiti, on people’s behavior. Researchers found that passersby were more likely to participate in vandalism and other minor infractions in environments where these kinds of activities were already taking place. This study was based on the “broken windows theory,” introduced in the early 1980s by Dr. George Kelling to explain how dilapidated areas, like abandoned buildings with broken windows, inspire further vandalism.
Of course, an unclean environment that doesn’t promote disgust, such as a slightly disheveled desk, is unlikely to lead to unethical behavior. For managers, parents, and other people who perpetually ask others to clean up their mess, though, this study provides one more point in favor of a clean work space.
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