Study Finds Happiness Is Infectious

Forget six degrees of separation. How about three degrees of happiness? Researchers from Harvard University and the University of California, San Diego have mapped the relationships of happy people and found that happiness is a collective phenomenon that spreads like a virus through social networks - affecting even strangers three times removed from each other. The theory builds on the notion of emotional contagion, the process at work when a person smiles back at someone who smiles at him. Human emotions appear in clusters, behaving like stampeding animals, says study co-author Nicholas Christakis.

"You would never think to ask a particular buffalo in a herd, ‘Why are you running to the left?'" says the Harvard Medical School sociology professor. "The whole herd is running to the left."

Misery, on the other hand, does not love company as much as happiness does. "Unhappiness doesn't spread as intensely or as consistently as happiness," he says.

The research, being published today in the British Medical Journal, is the latest analysis of data gleaned from the Framingham Heart Study, a longitudinal U.S. survey begun in 1948. The researchers, who have previously published similar findings on the spread of obesity and smoking from the data, focused on 4,739 individuals over 20 years, accounting for 50,000 social and family ties. As the mantra goes in real estate, the top factor in happiness is location, location, location.

Using a standard measure of well-being, the Center for Epidemiological Studies Depression scale, they found that when an individual becomes happy, a friend who lives nearby experiences a 25-per-cent increased chance of becoming happy. And the more centrally located you are in your social cluster of happy people, the more likely you are to become happy.

Read the rest of the article by Tralee Pearce here.