Stressed out, dude? Don’t go to Vegas.

USC (US)—New research shows that, unlike women, men under stress may be more likely to take risks, an impulse known to translate into real-life behaviors such as gambling, smoking, unsafe sex, and illegal drug use.

The study found that stressed women actually moderate their behavior and may be less likely to make risky choices.

“Evolutionarily speaking, it’s perhaps more beneficial for men to be aggressive in stressful, high-arousal situations when risk and reward are involved,” says Nichole Lighthall of the University of Southern California Davis School of Gerontology and lead author of the paper. “Applied to financial risk taking, it’s akin to competition for territory or other valuable resources.”

The researchers asked participants to play a game called the Balloon Analogue Risk Task in which inflating a balloon earns money (five cents per pump). Participants were told that they could cash out their earnings by clicking a “Collect $$$” button at any point in the game.

However, the balloon would explode if it was inflated beyond its randomly determined breakpoint. All winnings for exploded balloons would be lost.

“One valuable aspect of the [balloon task] is its predictive validity for real-world impulsivity,” Lighthall explains. “Some risk taking was necessary to make gains, but excessive risk was associated with diminishing returns. If you always clicked and never cashed out, you would lose every time.”

“Obviously, there are situations in the real world where risky behavior would not be beneficial,” Lighthall says. “Sometimes being conservative, thoughtful, and taking it slow are good things.”

In the control group, men and women displayed statistically similar levels of risk-taking, inflating the balloon about 40 times on average.

However, women in the stressed group only inflated the balloon an average of 32 times—more than 30 percent less often than their stressed male counterparts, who inflated the balloon an average of 48 times.

“Men seem to enter more risky financial situations than women, which was part of the impetus for our study,” Lighthall says. “But only in the stressed condition did we see any statistical differences in risky behavior between men and women.”

Stressful experiences have been shown to stimulate the release of cortisol, commonly known as the “stress hormone.” Participants randomly assigned to the stress group held a hand in ice-cold water, which raised cortisol levels, particularly among female participants. No participants were using hormone birth control.

According to Lighthall, future research might use neuroimaging to explore how the brain processes stress or examine whether psychological stress, such as anticipating giving a speech, would yield similar results as the physical stress manipulation used in this study.

Study results appeared July 1 in the journal PLoS One.

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