I’ve written a few posts about Doctor Nicholas Christakis and Doctor James Fowlers' research. This post is about their book - Connected: the Surprising Power of Our Social Networks and How They Shape Our Lives . Their research uses network analysis techniques to the aid the understanding obesity, smoking, happiness, back pain, sexual practices, beliefs, and other social phenomena. Their interesting finding is that all these phenomena are contagious.

Christakis and Fowler base their findings on a careful analysis of the Framingham Heart Study, conducted from 1948 to the present in a small Massachusetts city. They have mapped more than 50,000 ties between just over 12,000 people. In essence they argue that if friend’s friend’s friend - whom you’ve never met, and lives 50 kilometres away - is unhappy, then you’re likely to be unhappy as well. In other words there are three degrees of influence. They demonstrate the same outcome for smoking behaviour and obesity, and attribute it to “norming behaviour”. In short we are part of a collective (social network) that seeks homeostasis and is bound by certain rules. According to Christakis and Fowler these are:

Sometime ago I posted some commentary about this study by Doctor Nicholas Christakis and Doctor James Fowler, who used network analysis to aid understanding of obesity, and some commentary on this study where they used network analysis to aid the understanding smoking behaviour.  Both studies were published in the New England Journal of Medicine. I also posted some commentary about a study on happiness published in the January 2009 edition of the British Medical Journal, or BMJ for short.  Last year Doctors Christakis and Fowler published a book called Connected: The Surprising Power of Our Social Networks and How They Shape Our Lives.  I'll be doing a book review in the next few days.  In the meantime the video below features Doctor Fowler talking about their work - it's well worth viewing.