" What’s more, researchers have found that there is something uniquely out of balance about the adolescent brain that makes it especially susceptible to bad and impulsive decisions. Laurence Steinberg, a psychologist at Temple University, has analyzed two separate neurological systems that develop in childhood and early adulthood that together have a profound effect on the lives of adolescents. The problem is, these two systems are not well aligned. The first, called the incentive processing system, makes you more sensation seeking, more emotionally reactive, more attentive to social information. (If you’ve ever been a teenager, this may sound familiar.) The second, called the cognitive control system, allows you to regulate all those urges. The reason the teenage years have always been such a perilous time, Steinberg says, is that the incentive processing system reaches its full power in early adolescence while the cognitive control system doesn’t finish maturing until you’re in your twenties. So for a few wild years, we are all madly processing incentives without a corresponding control system to keep our behavior in check. And if you combine that standard-issue whacked-out adolescent neurochemistry with an overloaded HPA axis, you’ve got a particularly toxic brew. "

― Paul Tough , How Children Succeed: Grit, Curiosity, and the Hidden Power of Character