What's going on in there? Researcher explains teenage mind
Jamie Hanson, a postdoctoral fellow at Duke University and the University of North Carolina at Chapel Hill, explains what's happening inside a teenager's mind and what that means for parents.
Posted — UpdatedEver wonder what's really going on inside the brains of teens - the ones constantly clicking away on their phones or testing their parents' limits or responding to everything with eye rolls?
I checked in with Hanson by email to learn more about what researchers are learning about the teenage brain and what this all means for us parents. Here's our conversation:
Researchers started with a focus on brain structure (literally, how big or small different parts of the brain) were. More recently, fMRI (functional MRI) has allowed scientists to use experiments in children and teenagers to measure the processing of emotions, receiving rewards and making decisions. Some research groups are even (cleverly) manipulating social context in the MRI scanner, having participants play games against others or seeing how having a friend present at the lab impacts your brain activity.
All of this research has started to pay off, telling us some surprising new things. For example, did you know that some structures in the brain are changing up until the mid-20s! For the longest time, we thought the brain did most of its development in utero and in infancy.
The gray matter (it literally is grayer on an MRI) increases in volume until about puberty and then decreases in volume. Gray matter is “what fires in the brain." Researchers believe volume goes up to help behavioral flexibility (you can do lots of different activities), but goes down later to promote behavioral specialization (getting better at a few specific things).
The other tissue in the brain (white matter) is “the wires” of the brain. This tissue helps distant parts of the brain talk to one another quickly. It is kind of like insulation. White matter helps information in the brain, conveyed through electrical activity, from leaking out and being slower. The combination of those two major developmental patterns is one simple way that we have connected the massive changes in behavior during development, to something in the brain.
Also, the brain is highly plastic (or changeable). We are still understanding how genetic factors influence how the brain develops, as well as the role of experience. For example, do positive (or negative) experiences at certain times during childhood and adolescence have larger effects on the brain? We are just starting to study such questions.
Another thing is the power of peers. Research suggests that social interactions become really important in adolescence (hence the often non-stop texting with some adolescents). Some brain imaging work has found the brains of teens activate more strongly when interacting with their peers (compared to adults doing something similar). Again, parental support is crucial, giving teens’ time with peers feels rewarding (but staying in control and making smart choice when with peers is also critical).
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