psychotherapy:

…Another reason for increased happiness in experiences, the researchers found, was that people felt a greater sense of vitality or “being alive” during the experience and in reflection, Howell said.

“As nice as your new computer is, it’s not going to make you feel alive,” he said.

Most psychologists who study the phenomenon say people adapt to a new purchase in six to eight weeks, up to a maximum of three months, Howell said. That means the initial pleasure we get from a new possession generally fades in a matter of months.

Howell’s study builds on earlier work by Thomas Gilovich, professor and chairman of the psychologydepartment at Cornell University. Gilovich and colleague Leaf Van Boven’s seminal 2003 paper “To do or to have: That is the question” found similar results about possessions bringing less happiness than experiences.

Experts also point out that people are less self-conscious when comparing experiences than they are about possessions. It will probably bother you more that your friend’s home theater is better than yours than if your friend saw more sights on her South Seas vacation, Gilovich said.

Experiences form “powerful and important memories that I wouldn’t trade for anything in the world,” Gilovich said.