“Mapping emotion onto just the middle part of the brain, and reason and logic onto the cortex, is just plain silly,” says neuroscientist Barbara L. Finlay, editor of the journal Behavior and Brain Sciences. “All brain divisions are present in all vertebrates.” So how do brains evolve? They reorganize as they expand, like companies do, to keep themselves efficient and nimble.61 Figure 4-7: The “triune brain” idea, with so-called cognitive circuitry layered on top of so-called emotion circuitry.
