You know what’s not myelinated in middle school? The outermost part of the brain right underneath the forehead: the frontal lobe. Myelin just hasn’t quite made it all the way out there yet. In fact, this is one of the very last parts of the brain that will mature, with the last of the last being the tip-top of the frontal lobe, the area called the prefrontal cortex. The prefrontal cortex is where a person weighs the consequences of doing something versus not doing something—it is the part of the brain that helps make good, smart, big-picture decisions. Long-term decisions. The opposite of
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