Everything You Know About the Teen Brain Is Wrong

Angst and anger aren’t inevitable parts of the teenage experience.

Keith Negley

For most of human history, virtually everyone in the world believed the world was flat and the center of the universe. Most people still believe that a god created people, the earth and the rest of the universe just a few thousand years ago. This god has quite a sense of humor, apparently, he or she having stocked the earth’s strata with the fossils of animals that have been extinct for millions of years. Good one, god.

My point is that humans are not particularly clear thinkers. Generation after generation, the vast majority of us have steadfastly believed things that were entirely wrong, with only an obscure guru squatting in a dark, dingy cave somewhere knowing the actual truth.

I am one of those gurus, and, believe me, all that squatting is not easy.

Nearly 20 years ago, having noticed, uncomfortably, that my 15-year-old son seemed more mature than I was, I began wondering why he wasn’t allowed to drive, own property, open a business, drink alcohol or start a family. I “knew” that teens are all inherently incompetent and irresponsible, but he seemed to be neither. I “knew” that teens needed adult supervision and protection 24 hours a day, but he seemed to need neither. I also “knew” that teens couldn’t help being depressed, angry and generally screwy because nature made them that way.

Justin got angry at times, but what he was angry about — or so he said, anyway — was that I was treating him like a child when, in fact, he wasn’t. But I was supposed to treat him like a child, wasn’t I? Advertisements and articles and TV shows tell us we’re supposed to monitor our teens, search their rooms and take away their car keys, because they are incapable of making sound decisions. Right?

Still, Justin didn’t fit the profile, and I began to wonder: Are all teens in the world as messed up as American teens? Were teens always as disrespectful and reckless as they are today? Were they always prevented from working and forced to go to school, no matter how qualified they were to work or how frustrating the school experience was for them?

My curiosity set me on a course of discovery that has been difficult for me over the years. As I became increasingly immersed in historical data, anthropological and sociological studies, volumes of research in psychology, and, eventually, my own extensive survey data, it was especially difficult for me to face the fact that many of my own beliefs about teens were wrong — which implied, of course, that my parenting skills were lacking. It has also been difficult for me to watch a steady parade of so-called experts in neuroscience and psychology, some of whom I know personally, continue to reinforce faulty beliefs about teens. Isn’t truth supposed to “out” — to rise to the top like the cream in fresh milk?

Not always, it seems. When it comes to teens, American society has been steadily moving in the opposite direction for more than a century — away from the plain truth and toward more and increasingly outrageous fictions.

The “teen brain” idea is one of the newest fictions, driven by three powerful factors. First, neuroscientists have identified small differences between the brains of teens and the brains of older adults. (But brains change throughout our lives, don’t they? Why is that particular age demarcation singled out?) Second, the pharmaceutical companies, always in search of new markets, have promoted the teen brain idea because the obvious fix for a defective brain is medication. And third, parents with troubled or troublesome teens want easy explanations and remedies that absolve them of any wrongdoing. One result: In the U.S., more money is now being spent on psychoactive drugs for teens than on all other prescription drugs for teens combined, including antibiotics and acne medication.

But the assertion that teen turmoil is a natural and inevitable result of properties of a developing brain is completely false. It is not even slightly true, no matter how prestigious or distinguished the source of that assertion.

Correlation versus causation

Correlation does not imply causation. Let me put that slightly differently: Correlation does not even imply causation. I’d wager that all the people who make fraudulent claims about the teen brain these days were taught this important principle in their introductory college courses, yet they violate it every time they make those claims.

The principle is crucially relevant to the teen brain concept because all the studies used to support this myth are correlational. They simply document average differences between the brains of teens and the brains of older adults. These differences are then said to explain the fact that teens in our culture are often troubled or troublesome. In other words, researchers start with the observation that teens behave differently than older adults in some respects, then notice differences between teen and adult brains, and voilà! They conclude, absurdly, that the brain differences cause the behavior differences. See the problem?