Psychologists use another term for neurological maturity: executive function. The lack of executive function is what led to Ashley’s compulsive cutting and running streak and my own raging immaturity. Executive function has nothing to do with IQ, potential, or talent. It is simply the ability to see ahead and plan effectively, to connect actions to possible consequences, to see the probabilities of risk and reward. It includes developing a sense of self (self-identity, individual beliefs, and personal values), regulating emotions, and setting goals.

