brains are like companies, to use a phrase from the neurobiologist george streeter, as they grow they reorganize. they reorganize to become efficient. there's actually is highly debated still -- for the most part most of the cortex, cerebral cortex of your brain can be found in every mammal. there is one or two parts were people debate about whether it is new to primates let's say and even in those cases i think it's pretty clear to a lot of us that there is no neocortex and that it's actually certain parts of the brain have grown bigger because they developed for longer in development. i guess my -- to say that one of the most deeply held views and one of the most cherished views of human nature is embedded in the triune brain idea and it's fundamentally flawed and i must say that the law embodies the triune brain. economics in this idea that we have these our mind is a battleground between emotion and cognition and that those two are in battle to control your behavior. that's a myth basically. how do people respond. it depends on who you ask. evolutionary biologists have celebrate t