PSYCHOLOGY
This Is Your Brain on Optimism

New research reveals the biological roots of positive thinking. How a rosy outlook can affect your health.

By Sarah Kliff | Newsweek Web Exclusive
Oct 24, 2007 | Updated: 1:06 p.m. ET Oct 24, 2007

We humans tend to be an optimistic bunch. In fact, it's long been established by psychologists that most people are likely to be irrationally positive. The optimism bias, as it's called, accounts for the fact that we expect to live longer and be more successful than the average and we tend to underestimate the likelihood of getting a serious disease or a divorce. This tendency is adaptive—many researchers have claimed that a positive outlook motivates us to plan for our future and may even have an effect on our long-term physical health.

Optimism may be so necessary to our survival that it's hardwired in our brains. A new study published in the journal Nature further confirms the idea that having a rosy outlook is a personality trait with deep, neurological roots. Researchers found that the brains of optimistic people actually light up differently on a scan than those who tend to be more pessimistic when they think about future events.

The disparity between positive and pessimistic minds is especially prominent in areas of the brain that have been linked to depression. "The same areas that malfunction in depression are very active when people think about positive events," says Tali Sharot, a post-doctorate fellow at University College London, who conducted the research at New York University.

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