My Blog Of Knowledge: Suppressed Emotions Can Lead to Aggression

By Rick Nauert PhD Senior News Editor
Reviewed by John M. Grohol, Psy.D.on March 24, 2011

Emerging research suggests bottled up emotions can make people more aggressive.

Scientists from the University of Texas at Austin and the University of Minnesota believe knowledge of the link could help military and law enforcement professionals cope with long hours and stressful situations. And awareness of the link between latent emotions and aggression may improve efforts to reduce violence.

The psychologists used a pair of classic movie scenes in their research. They found that subjects who were asked to suppress their emotions and show no reaction to a notoriously disgusting scene in the 1983 film “The Meaning of Life” and another in the 1996 film “Trainspotting” were more aggressive afterwards than subjects who were allowed to show their revulsion.

The research reinforces scientists’ understanding of the “ego depletion effect,” which suggests people who must keep their emotions bottled up — not reacting to a difficult boss at work, for example — are more likely to act aggressively afterwards — say, by yelling at their children.

Subjects in the experiment who were deprived of sleep before watching the scenes reacted no differently than those who were well rested. This suggests that fatigue does not make people more aggressive, as some previous studies have suggested.

“Our research suggests people may become more aggressive after they have to control themselves,” says co-author Dr. Arthur Markman, psychology professor at UT Austin. “Whatever psychological mechanisms are at work when people deal with stress and then have to exercise self-control later are not the same thing that happens when you’re tired.”

Markman wrote the study with Dr. Todd Maddox of UT Austin, and Dr. Kathleen Vohs and Brian Glass, both of the University of Minnesota.

The study was funded in part by a grant from the U.S. Army.

Subjects in the study included U.S. Army soldiers, cadets at the United States Military Academy at West Point and other college students.

Half of the subjects were asked to remain awake for 24 hours before watching the overeating scene from “The Meaning of Life” and the toilet bowl scene from “Trainspotting.”

The others were permitted to sleep. Some of the subjects were then asked to watch the scenes without visibly reacting (monitors made sure they didn’t cheat) while the others were able to watch the scenes with no restrictions.

All subjects were then placed in a computerized competition in which they could blast an online opponent with noise. (In reality, there was no opponent and no one was blasted, though subjects thought they were doing so.)

Those subjects who had suppressed their emotions while watching the movie scenes began the competition by setting the noise level at between 6 and 7 on a scale of 10 while the others set the noise level at between 4 and 5, on average.

The study was published in the journal Social Psychological and Personality Science.

Source: University of Texas Austin

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