Understanding the Brain of a Defiant Teenager

Most moms and dads don’t understand why their defiant teens behave in an impulsive, irrational, and sometimes dangerous way. At times, it seems like these young people don’t think things through or fully consider the consequences of their actions. They differ from their "normal" peers in the way they behave, solve problems, and make decisions. There is a biological explanation for this difference. Researchers have identified a specific region of the brain called the amygdala, which is responsible for instinctual reactions (e.g., fear, aggressive behavior). This region develops early; however, the frontal cortex (i.e., the area of the brain that controls reasoning and helps us think before we act) develops later. This part of the brain is still changing and maturing well into the early- to mid-twenties. Other specific changes in the brain during the teenage years include a rapid increase in the connections between the brain cells and pruning (i.e., refinement) of brai...