the prefrontal cortex isn’t a kind of command module that evolution invented when we got promoted from mere animals to human beings; it’s not something that finally tamed our unruly feelings and put us under rational control. No, the powers of reason embedded in the prefrontal cortex are themselves under the control of feelings. The value system embedded in the feelings—natural selection’s conception of what’s good and what’s bad, what we should pursue and what we should avoid—continues to be, more or less, the prevailing value system.
