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It's not easy being a teenager. There's the angst. The emotions. The raging
hormones! And although hormones do play a big role in puberty, the brain is going
through a lot of changes too. Neuroscientists are learning thatt some of
the most puzzling teenage behavior may actually have some real benefits.
legally, you're considered an adult when you turn18, but from the neuroscience perspective,
your brain is really still developing. "And the current literature suggests that
it's about around age 25 or so is when the brain finishes the period of
adolescence." This is Dr. Adriana Galván and she runs the developmental
neuroscience lab at UCLA. The brain develops from the back to the front, so
the prefrontal cortex is the last region to fully develop. "The prefrontal cortex
is the part of the brain you need to make good decisions, to think about the
future, think about consequences." You can kind of think of it like the Spock of
the brain: logical, calm and collected. And then deeper in the brain there are these
emotional systems, like the limbic system, that are more interested in immediate
gratification. They're sort of like Captain Kirk: a risk-taker and a bit
emotional. During the teenage years, the limbic system develops really quickly
and the prefrontal cortex is trying to catch up. Eventually as individuals
become adults, the prefrontal cortex will increasingly have more influence over
behavior than the impulsive part of the brain. So without a fully developed
prefrontal cortex, you can kind of see why teens might be more impulsive or
just worry less about future consequences. Another brain region that's
really active during adolescence is this thing called the striatum and it's a key
part of the brain's reward system. Let's say you find 20 bucks on the street or
someone gives you a cookie. The striatum goes off and it releases dopamine into
the brain. Adrianna's lab discovered that the
teenage brain is super sensitive to different rewards like sugar and money.
Way, way more than in the brains of adults and children. And all of this
activity in the brain's reward center, it may actually serve a purpose.
"We asked teenagers to come to the lab and we scanned their brains while they
performed a learning task. They were shown a picture of a butterfly and two
flowers and they were asked to guess which flower the butterfly would land on."
After each guess, they were given feedback. When the teens got it right,
their striatum would get really, really active. "They would learn over time that
the butterfly preferred one flower over the other — and everybody learned this,
but what we found is that the adolescents learned it more quickly than
adults and with greater accuracy." So having this reward center that's
hyperresponsive to feedback actually helps teenagers learn from their environment.
But this same region of the brain is also connected to risk-taking data from
Adriana's lab suggests that teens with a more reactive striatum are more likely
to engage in risky behavior and to enjoy it. "Rather than ask how you keep your
teenager from taking risks — because we know the brain is really oriented
towards risk during this time — it's better to ask, 'How do I provide
opportunities for healthy risks?'" Like trying out for the school play, even if
you've never acted before. Or asking someone out on a date.
Those are real risks to a teenager, but they're not the kind of risks that
parents typically worry about. "It makes sense from an evolutionary perspective
that there's a time in life when teens want to become more independent,
seek out new opportunities. In the animal world, this would translate into looking
for new food resources or foraging behavior and in teenagers it often
manifests as risk-taking behavior and simply moving away from a family unit."
Teenagers are gonna make mistakes, but they've got this brain that's
encouraging them to learn and explore and push boundaries. "So adolescence is a
really special time and I think we don't appreciate enough their energy and their
ability to lead and to motivate and how excitable they find life in a way that
we maybe — maybe we don't later in life." Our brains keep changing throughout our
lives and researchers at UC Berkeley are learning that if you give people a
little bit of power it can have a big effect on the brain.
Learn more by watching our video here and be sure to subscribe for more Figure 1
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