It's interesting to consider this within the context of societal rights of passage involving extended solitude such as the walkabout in Aboriginal culture. You

It's interesting to consider this within the context of societal rights of passage involving extended solitude such as the walkabout in Aboriginal culture. You basically have a situation where the community invested in an activity that grew this part of the brain. I'm wondering if it also explains deification of animals in many primitive cultures where solitude was more common because there were fewer people and more opportunities for solitude.