In Focus:

Teenage Brains Are So Hard to Understand

When Frances Jensen’s eldest son, Andrew, reached high school, he underwent a transformation. Frances’s calm, predictable child changed his hair color from brown to black and started wearing bolder clothing. It felt as if he turned into an angst-filled teenager overnight. Jensen, now the chair of the neurology department at the Perelman School of Medicine at the University of Pennsylvania, wondered what happened and whether Andrew’s younger brother would undergo the same metamorphosis. So she decided to use her skills as a neuroscientist to explore what was happening under the hood. “I realized I had an experiment going on in my own home,” says Jensen, author of The Teenage Brain.

That was about 10 years ago, when society at large was only beginning to catch up to the idea that the teen brain was not a fully developed adult brain, just with less mileage. For generations, the overarching thinking was that the brain had reached its full growth by the time a child reached puberty. But thanks to the research of people like Jensen and many others, beginning in the 1990s, it’s become clear that the teenage brain is some- thing much more complex—and special.

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