For example, two recent studies looked at how people learned to connect images (影像) with either rewards or punishments. In one experiment, some of the participants were first stressed by having to give a speech and do difficult math problems in front of an audience; in the other, some were stressed by having to keep their hands in ice water. In both cases, the stressed participants remembered the rewarded material more accurately and the punished material less accurately than those who hadn’t gone through the stress.

　　This phenomenon is likely not surprising to anyone who has tried to resist eating cookies or smoking a cigarette while under stress—at those moments, only the pleasure associated with such activities comes to mind. But the findings further suggest that stress may bring about a double effect. Not only are rewarding experiences remembered better, but negative consequences are also less easily recalled.

　　The research also found that stress appears to affect decision- making differently in men and women. While both men and women tend to focus on rewards and less on consequences under stress, their responses to risk turn out to be different.

　　Men who had been stressed by the cold- water task tended to take more risks in the experiment while women responded in the opposite way. In stressful situations in which risk- taking can pay off big, men may tend to do better; when caution weighs more, however, women will win.

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