Thanks for your reply.
In fact, I thought the term EEA referred to the whole of our evolutionary history, or rather the whole collection of environments our ancestors found themselves in. But in evolutionary psychology, the only EEA people ever seem to create hypotheses about is the 'Pleistocene'. Hunter-gatherers and all that. On the one hand it may seem unlikely that an evolutionary 'novel' system like the neocortex has remains of 'frog'-brains in it, but on the other hand there is the triune-brain theory from MacLean. Is anything ever done with that in evolutionary psychology, as far as you or anyone knows?
Eric