The Science of Friendship

In the 'Call Your Girlfriend' podcast episode 'The Science of Friendship,' hosts Aminatou Sow and Ann Friedman engage with science journalist Lydia Denworth, author of 'Friendship: The Evolution, Biology, and Extraordinary Power of Life’s Fundamental Bond.' The conversation delves into the biological and evolutionary underpinnings of friendship, a topic sparked by Denworth's personal transitions and her curiosity about the subject's scientific significance, which she encountered at a social neuroscience conference. The discussion unfolds to reveal that friendship, traditionally celebrated but not deeply scrutinized scientifically, has significant biological and evolutionary implications. Denworth explains that the concept of 'survival of the fittest' has a companion narrative, 'survival of the friendliest,' suggesting that the ability to forge strong friendships is crucial for a longer and healthier life. The episode explores how social connections shape our biology, touching on the neuroscience of empathy, the development of theory of mind in children, and the impact of loneliness versus the benefits of social connection.

The conversation moves to the concept of the 'social brain' and how significant portions of our brain are dedicated to processing social interactions and relationships. Denworth discusses recent studies, such as the Dartmouth and UCLA research that used fMRI machines to predict friendships based on brain responses to video clips. This research hints at the idea that friends process the world in similar ways, both cognitively and emotionally. The hosts and Denworth also touch on the complexities of friendship dynamics, such as the balance between similarity and difference among friends, and the role of shared aspirations and life goals in forming deep connections.

The episode also addresses the terminology used by scientists to describe social relationships, including the distinction between kinship and friendship. Denworth clarifies that the new science of friendship blurs these lines, emphasizing the quality of bonds over their origin. She introduces the concept of a 'social convoy,' which consists of a few close relationships that are central to our lives, regardless of whether they are family or friends. The importance of these relationships is underscored by their profound impact on our health, affecting everything from stress responses to cellular aging.