Rick Hanson PhD
Oct 23, 2013
When our mammalian ancestors first appeared, about two hundred million years ago, their capacities for bonding, emotion, and generosity were extraordinary evolutionary breakthroughs. Unlike reptiles and fish, mammals and birds care for their young, pair bond (sometimes for life), and usually form complex social groups organized around various kinds of cooperation. This takes more smarts than, say, a fish laying a swarm of eggs and swimming away – so in proportion to body weight, mammals and birds have bigger brains than reptiles and fish do.
When primates came along about sixty million years ago, there …