Key friendships vital for effective human social networks

Close friendships facilitate the exchange of information and culture, making social networks more effective for cultural transmission, according to new UCL research that used wireless tracking technology to map social interactions in remote hunter-gatherer populations. The research demonstrates how increased network efficiency is achieved through investment in a few strong links between non-kin friends connecting unrelated families, as well as showing that strong friendships are more important than family ties in predicting levels of shared knowledge among individuals. The study, published today in Nature Human Behaviour , was funded by the Leverhulme Trust. Hunter-gatherers offer the closest existing examples of human lifestyles and social organisation in the past, offering vital insights into human evolutionary history. To map the social networks of populations of Agta and BaYaka hunter-gatherers in Congo and the Philippines, researchers from the Hunter-Gatherer Resilience Project in UCL Anthropology used devices called mote - a wireless sensing technology worn as an armband that can record the interactions a person has in one day. The motes recorded all one-to-one interactions at two minute intervals for 15 hours a day over a week in six Agta camps in the Philippines (200 individuals, 7, 210 interactions) and three BaYaka camps in the Congo (132 individuals, 3,397 interactions). With this data, they were able to construct and examine social networks for both groups in unprecedented detail.