Ages 15–18 | Ages 11–14

The Wild, Wonderful Teenage Brain: Hardwired to Test Parental Patience?

teenage brainAre you fuming with anger, sick with worry or just plain bewildered? You’re probably living with a thrill-seeking, risk-embracing teenager, simultaneously capable of precocious wisdom and incredibly foolish choices. 

Although teen transgressions, such as driving too fast, skipping curfew or choosing delinquent pals, may seem like personal affronts, this behavior actually may have very little to do with you, says Temple University psychology professor and researcher Laurence Steinberg, Ph.D. According to Steinberg, teens act differently because their brains are, in fact, different.

Teens don’t behave recklessly to test your parental patience or to put themselves in harm’s way, says Steinberg. Instead, they are hardwired to make immature choices, courtesy of their unique, still-developing brain. New research is illuminating the previously mysterious, misunderstood teenage brain, and helping parents and educators determine how best to reach their teens — and how to keep them safe.

Under construction

Old beliefs about the teenage brain stemmed from the fact that brain growth grinds to a halt after puberty: The brain reaches 90 percent of its adult mass by age 6 and is full-size by age 12. Few neurons are added as it grows — children’s brains reach peak neuron capacity in utero and begin losing, or “pruning,” neurons before birth. Based on these basic facts about the brain’s size, scientists theorized that most cerebral development is completed in early childhood. 

But the development of magnetic resonance imaging (MRI) in recent decades opened a new window into the adolescent brain. Research and MRI scans conducted by Jay Giedd, M.D., and others at the National Institute of Mental Health show that the adolescent brain is still very much under construction. Instead of adding new neurons, though, adolescent brains are busy building and strengthening the pathways between nerve cells. According to Giedd, this ongoing process results in a more efficient brain. 

It does not, however, result in a more mature, adult-like brain. Steinberg’s research shows that teens are more likely to make risky decisions than adults, because the growth of their socio-emotional brain system outpaces the growth of cognitive controls that serve to regulate emotions and behavior. In other words, teens are developing more efficient thinking without the inhibitory controls of the adult brain. These changes continue into young adulthood, finishing up between the ages of 22 and 25, says Steinberg.

All this may be bad news for today’s frustrated parents. But the unique structure of a teen’s brain probably serves an evolutionary function, says Steinberg. Teens’ penchant for taking risks makes them more independent, which was probably a critical adaptation for reproduction. “All mammals go through puberty, leave their natal environment and venture out into the wild, which is a very risky behavior,” he notes.

Communication clash

Given the differences between the brains of teens and those of their parents, it’s not hard to understand the parent-teen conflicts that rage during adolescence. “Communication has been found to be the best way to improve teens’ behavior, and yet communicating with someone who does not want to communicate with you is a challenge,” says Sheryl Feinstein, Ph.D., chair of the education department at Augustana College in Sioux Falls, S.D., and author of Inside the Teenage Brain: Parenting a Work in Progress.

Parents, with their adult brains, tend to approach communication and discipline logically, says Feinstein. The problem is that teens haven’t yet developed this type of logical thinking; instead, they view the world through a more emotional lens. “You can see how difficult it is for parents when we approach a problem with logic and reasonable thinking, while teens approach the problem with fury and negative thinking,” says Feinstein.

This can lead to screaming, door slamming and “a true test of a parent’s patience and tolerance,” she says. But once parents understand that teens have unique brains and can’t be expected to think like adults, teen behavior becomes easier to tolerate. “Parents need to communicate with teens on their terms. Mandating severe punishments almost always results in rebellion,” Feinstein says.

Risky business

With limited cognitive controls and immature communication abilities, teens can run into danger in risky situations — scenarios they intentionally seek out, says Ronald E. Dahl, M.D., professor in the School of Public Health at the University of California at Berkeley. According to Dahl, when puberty floods the brain’s limbic system with the sex hormones estrogen and testosterone, teenagers are driven to seek out “intense experiences,” flocking to intense horror movies, dizzying carnival rides and graphic video games.

This taste for thrills can also lead to run-ins with the law, says Steinberg, particularly when teens are with their peers. In recent research published in Developmental Science and Journal of Research on Adolescence, he reports that in the presence of peers, teens are more likely to make risky decisions and choose more immediate rewards — effects not seen in adults. Simply put, thrusting a teenager plus a peer or two into a risky or volatile situation can lead to poor choices and even worse outcomes with lasting consequences, from a juvenile record to disability and death. 

This provides strong support for laws prohibiting newly licensed teen drivers from driving with friends in the car. In Washington state, drivers younger than 18 are not allowed to shuttle non-family passengers younger than 20 years old for six months after receiving a driver’s license. Such laws protect teen drivers from their own penchant for risky behavior in the presence of peers, says Steinberg.

The good news: In a few years, your teen’s brain will settle down, and he’ll think more like you. Communication combat will cease, and risky thrills will lose their allure. In the meantime, try to enjoy the ride. 

Malia Jacobson is a nationally published journalist specializing in health and parenting.


Wise-Minded Parenting: 7 Essentials for Raising Successful Tweens + Teens, a new book by Laura S. Kastner, Ph.D. with Kristen A. Russell, offers tools to help parents navigate the tween and teen years. Go to wisemindedparenting for more details, and to order the book. Watch for more insights into how the teenage brain works in next month’s ParentMap. Kastner and Russell will share the latest information on self-control — and why it helps kids succeed.

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