Happiness Can Spread Among People Like a Contagion reports the Washington Post
Happiness is contagious, spreading among friends, neighbors, siblings and spouses like the flu, according to a large study that for the first time shows how emotion can ripple through clusters of people who may not even know each other.
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"You would think that your emotional state would depend on your own choices and actions and experience," said Nicholas A. Christakis, a medical sociologist at Harvard University who helped conduct the study published online today by BMJ, a British medical journal. "But it also depends on the choices and actions and experiences of other people, including people to whom you are not directly connected. Happiness is contagious."
One person's happiness can affect another's for as much as a year, the researchers found, and while unhappiness can also spread from person to person, the "infectiousness" of that emotion appears to be far weaker.
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Other experts praised the study as a landmark in the growing body of evidence documenting the influence of personal connections and the importance of positive emotions.
"It's a pathfinding article," said Martin E.P. Seligman, a University of Pennsylvania psychologist. "It's totally original, and the findings are striking."
Stanley Wasserman, who studies social networks at Indiana University, said: "We've known that one's network ties are important, but we've never looked at anything on this scale. The implications are you can't look at individuals as little entities devoid of their social context."
The New York Times adds the following quotation of Christakis
. “There’s kind of an emotional quiet riot that occurs and takes on a life of its own, that people themselves may be unaware of. Emotions have a collective existence — they are not just an individual phenomenon.”
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The subtle transmission of emotion may explain other findings, too. In the obesity and smoking cessation studies, friends were influential even if they lived far away. But the effect on happiness was much greater from friends, siblings or neighbors who lived nearby.
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Another surprising finding was that a joyful coworker did not lift the spirits of colleagues, unless they were friends. Professor Fowler believes inherent competition at work might cancel out a happy colleague’s positive vibes.