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Risky Teen Behavior May Signify a Mature Brain

A surprise research finding suggests teens who engage in dangerous activities have brain patterns associated with a mature or adult brain.

The brain imaging study found adolescents who engage in dangerous activities have frontal white matter tracts that are more adult in form than their more conservative peers.

The brain goes through a course of maturation during adolescence and does not reach its adult form until the mid-20s.

A long-standing theory of adolescent behavior has assumed that this delayed brain maturation is the cause of impulsive and dangerous decisions in adolescence.

The new study, using a new form of brain imaging, calls into question this theory.

In order to better understand the relationship between high risk-taking and the brain’s development, Emory University and Emory School of Medicine neuroscientists used a form of magnetic resonance imaging (MRI) called diffusion tensor imaging (DTI) to measure structural changes in white matter in the brain.

The study’s findings are published in the journal PLoS ONE.

“In the past, studies have focused on the pattern of gray matter density from childhood to early adulthood,” says Gregory Berns, MD, PhD, principal investigator and professor of psychiatry and neuroeconomics at Emory University and director of the Center for Neuropolicy.

“With new technology, we were able to develop the first study looking at how development of white matter relates to activities in the real world.”

Gray matter is the part of the brain made up of neurons, while white matter connects neurons to each other. As the brain matures, white matter becomes denser and more organized. Gray matter and white matter follow different trajectories. Both are important for understanding brain function.

The study enrolled 91 adolescents ages 12 through 18 over a three-year period. Levels of engagement in dangerous behaviors were measured by a survey that included questions about the teens’ thrillseeking behaviors, reckless behaviors, rebellious behaviors and antisocial behaviors. DTI was used to measure corresponding structural changes in white matter.

“We were surprised to discover that risk-taking was associated with more highly developed white matter – a more mature brain,” says Berns. “We were also surprised to learn that except for slightly higher scores in risk-taking, there was no significant difference in the maturity of the white matter between males and females.”

Berns suggests that doing adult-like activities requires sophisticated skills.

“Society is a lot different now than it was 100 years ago when teens were expected to go to work and raise a family,” says Berns. “Now, adolescents aren’t expected to act like adults until they are in their twenties, when they have finished their education and found a career.

“You could make the case that in this country, biological capacity shows up long before the wisdom that comes with time is fully developed,” notes Berns.

Berns says more studies need to be done to determine if early brain development predisposes someone to engage in risky behaviors, or if the risky behavior drives the maturation of the brain.

The CDC reports that, 27,000 people between the ages of 10 and 24 die from bad decisions in the United States per year. Additionally, it has been shown that the period of mid-adolescence (ages 15 through 19) is the time when teens are more likely to begin high-risk behaviors such as drinking, abusing drugs or driving recklessly.

Source: Emory University

Risky Teen Behavior May Signify a Mature Brain

Rick Nauert PhD

Rick Nauert, PhDDr. Rick Nauert has over 25 years experience in clinical, administrative and academic healthcare. He is currently an associate professor for Rocky Mountain University of Health Professionals doctoral program in health promotion and wellness. Dr. Nauert began his career as a clinical physical therapist and served as a regional manager for a publicly traded multidisciplinary rehabilitation agency for 12 years. He has masters degrees in health-fitness management and healthcare administration and a doctoral degree from The University of Texas at Austin focused on health care informatics, health administration, health education and health policy. His research efforts included the area of telehealth with a specialty in disease management.

APA Reference
Nauert PhD, R. (2015). Risky Teen Behavior May Signify a Mature Brain. Psych Central. Retrieved on September 23, 2018, from https://psychcentral.com/news/2009/08/27/risky-teen-behavior-may-signify-a-mature-brain/8017.html

 

Scientifically Reviewed
Last updated: 6 Oct 2015
Last reviewed: By John M. Grohol, Psy.D. on 6 Oct 2015
Published on PsychCentral.com. All rights reserved.