SMU Associate Professor of Psychology Norman Li and evolutionary psychologist Satoshi Kanazawa of the London School of Economics conducted research which found that social interactions, even with friends, can be a problem for more intelligent people. They surveyed 15,000 people between the ages of 18 and 28, and discovered that people who live in more densely populated areas tend to report less satisfaction with their life overall. They also found that the more social interactions with close friends a person has, the greater their self-reported happiness. But there was one big exception. For more intelligent people, these correlations were diminished or even reversed.