Robin Dunbar

Robin Dunbar is Emeritus Professor of Evolutionary Psychology at the University of Oxford, the originator of Dunbar's number, a TED speaker and best-selling author. His work measures the social brain: how many relationships a human mind can hold, how they arrange themselves into layers, and what each one costs in time to keep alive.

His 2021 book, Friends: Understanding the Power of our Most Important Relationships, gathers the science this episode walks through: the friendship layers, the seven pillars, the 200-hour rule and singing as the icebreaker effect.

On this episode of The BEYOND Podcast, Robin Dunbar sets out the argument in full: Friendship runs on hard, measurable constraints rather than sentiment: Dunbar's number, the roughly 150-person limit, resolves into nested emotional layers (5, 15, 50, 150, then 500 and 1500), each demanding a fixed time investment of about 200 hours of face-to-face contact to make a close friend, while cultural similarity (the seven pillars of friendship), trust and shared bonding behaviours (the social toolkit, above all singing) decide who we keep. The named concepts the conversation walks through, in his own words on the recording: the named friendship layers; the seven pillars of friendship (the culturally-acquired similarity markers); the 200-hour rule; the Jane Austen problem / Mr. Darcy effect and 'friends of convenience'.

The Robin Dunbar podcast appearance on The BEYOND Podcast carries the conversation in full. Read the episode synopsis on BEYONDai, and find every episode on the The BEYOND Podcast page.