The Evolution of the Lizard Brain

The evolutionary story we have told ourselves for a long time has been a summarized by thi concept given to us, palmclean of the triune brain. And ise people refer to their their lizard brain. Or they think of a step wise evolution from reptiles to mammals,. generally, and then to primates as having climbed up from the brain stem to the cortex. What's wrong with this picture? Well, wrong with that picture is that it doesn't really match the best available scientific evidence for how brains evolved.