This growth of the frontal cortex seems like a promising explanation for the divisions we experience in our minds. Perhaps the frontal cortex is the seat of reason: It is Plato’s charioteer; it is St. Paul’s Spirit. And it has taken over control, though not perfectly, from the more primitive limbic system—Plato’s bad horse, St. Paul’s flesh. We can call this explanation the Promethean script of human evolution, after the character in Greek mythology who stole fire from the gods and gave it to humans.
