A friend and I were walking around Los Angeles when a skinny teenager came up and asked for money to buy milk. My friend handed him $20. I thought she was a fool.

A few days later, when we were in the same area, the teen approached us again. Yup, I thought, he knows an easy mark. But instead of asking for more money, he thanked my friend for what she'd already given him and told her how he'd managed to get some food and was now feeling much more positive about life. Then he walked on.

I thought my friend was far too gullible, but some would say I was too skeptical. Nobody wants to be a sucker, but is that reason enough to be a hard-boiled cynic?

"We think of people who are very trusting as being naive," says Nancy Carter, PhD, a director at the Nova Scotia Health Re-search Foundation. "But that's not always the case—being more trusting may make us better at knowing when we're being played." Carter points to a study she did at the University of Toronto in which participants were asked to pick which job applicants had been dishonest after watching videos of interviews in which half the candidates told three lies. It turned out that the people who ranked as "high trusters" were more likely to detect the frauds, in part by picking up on subtle cues (some studies have shown that liars tend to fidget more and speak in higher-pitched voices).

When I heard about Carter's study, I actually felt a twinge of envy. These high trusters could rely on their instincts to accurately size someone up, while my reflex was to be wary of just about everyone. Recently, after I'd left my car at the auto shop for repairs, I spent hours fretting that the mechanic was going to do a lousy job. Finally, my exasperated husband said, "What if he's actually good? Why can't you look at it that way?" He was right—too often my default mode was to assume that people were out to rip me off, do me wrong, and generally act selfishly. By constantly fearing that I was going to be taken, I was piling needless anxiety on myself and driving my family crazy. Could making the effort to see the best in others—even for just one weekend—help me rein in my cynicism enough to stop mistrusting the world?

I began my experiment when I ran into a neighbor at a cocktail party. In the past, I'd avoided her because she seemed judgmental; this time I struck up a conversation. After learning that our children were entering high school together, I decided to trust her with a private fear and shared my anxieties over how my son was adapting to the new environment. To my surprise, she was worrying about the same thing with her own child. Far from trampling on my emotions in a vulnerable moment, she was actually sympathizing with me. As I left the party, I told her I'd love to stay in touch. We weren't new best friends, of course, but I couldn't help wondering how many other relationships I had shortchanged by being so quick to write people off. After all, it's rare that I find myself in a position to realize when I've misread people—and even rarer to have the opportunity to give them a second chance.

Next: How seeing the good in others can help you feel better about yourself

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