The New Science of Happiness

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One of the biggest issues in happiness research is the question of how much our happiness is under our control. In 1996 University of Minnesota researcher David Lykken published a paper looking at the role of genes in determining one's sense of satisfaction in life. Lykken, now 76, gathered information on 4,000 sets of twins born in Minnesota from 1936 through 1955. After comparing happiness data on identical vs. fraternal twins, he came to the conclusion that about 50% of one's satisfaction with life comes from genetic programming. (Genes influence such traits as having a sunny, easygoing personality; dealing well with stress; and feeling low levels of anxiety and depression.) Lykken found that circumstantial factors like income, marital status, religion and education contribute only about 8% to one's overall well-being. He attributes the remaining percentage to "life's slings and arrows."

Because of the large influence of our genes, Lykken proposed the idea that each of us has a happiness set point much like our set point for body weight. No matter what happens in our life--good, bad, spectacular, horrific--we tend to return in short order to our set range. Some post-tsunami images last week of smiling Asian children returning to school underscored this amazing capacity to right ourselves. And a substantial body of research documents our tendency to return to the norm. A study of lottery winners done in 1978 found, for instance, that they did not wind up significantly happier than a control group. Even people who lose the use of their limbs to a devastating accident tend to bounce back, though perhaps not all the way to their base line. One study found that a week after the accident, the injured were severely angry and anxious, but after eight weeks "happiness was their strongest emotion," says Diener. Psychologists call this adjustment to new circumstances adaptation. "Everyone is surprised by how happy paraplegics can be," says Kahneman. "The reason is that they are not paraplegic full time. They do other things. They enjoy their meals, their friends. They read the news. It has to do with the allocation of attention."

In his extensive work on adaptation, Edward Diener has found two life events that seem to knock people lastingly below their happiness set point: loss of a spouse and loss of a job. It takes five to eight years for a widow to regain her previous sense of well-being. Similarly, the effects of a job loss linger long after the individual has returned to the work force.

When he proposed his set-point theory eight years ago, Lykken came to a drastic conclusion. "It may be that trying to be happier is as futile as trying to be taller," he wrote. He has since come to regret that sentence. "I made a dumb statement in the original article," he tells TIME. "It's clear that we can change our happiness levels widely--up or down.''