Social Network Size Linked to Brain Size: Scientific American

Some new Dunbar numbers

"Now, in the journal Proceedings of the Royal Society B, Dunbar and his colleagues have shown that the size of each individual’s social network is linearly related to the neural volume in a frontal region of each individual’s brain, the orbital prefrontal cortex. This provides strong support for Dunbar’s original conjecture at the individual level for what was previously proposed based on species-level data: Our brains are not as large as they are in order to provide each of us with the raw computational power to think our way out of a sticky situation, instead our brain size helps each of us to deal with the large and complex network of relationships we rely on to thrive."

Social Network Size Linked to Brain Size: Scientific American