In Luna's studies, brain behavior changed in parallel with improving scores. Older volunteers showed higher activity in brain regions involved in identifying errors, such as the anterior cingulate cortex. Related research has shown that older adolescents have stronger bridges of neural tissue connecting the emotional and motor centers of their brains with the prefrontal cortex, an "executive" brain region known for, among many other things, inhibiting impulses and tempering bubbling emotions. Luna and other researchers now think that, more than the growth of any single brain region, this increasing interconnectedness characterizes brain development in the twenties. Of course, that doesn't mean that once someone leaves behind their twenties they will never again lose their cool or act thoughtlessly instead of prudently. Individual variation makes all the difference. Some teens and twenty-somethings are simply more cautious and composed than some adults.

For now, let's put the brains of ancient twenty-somethings out of our minds. What about the twenty-somethings of today? Even if the brain's developmental changes are more dramatic in the teens than in the twenties, the best available evidence suggests that a twenty-something's brain boasts a little more adaptability than an older brain. Our twenties might represent a final opportunity to begin mastering a particular skill with a kind of facility we cannot enjoy in later decades. Should people in their twenties buckle down and choose something, anything, to practice while their brains are still nimble? Does the neuroscience suggest that, for all their freedom and fun, gallivanting twenty-somethings neglect their last years of heightened plasticity? Should parents encourage their 20-year-olds to shirk adult responsibilities lest they hamper an advantageous period of self-discovery and wild experimentation?


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In the meantime, twenty-somethings can expect increasingly frequent waves of sage advice from academics, bloggers and concerned parents alike. "Watching talking cats on YouTube isn't as good for cognitive development as reading or taking classes," Laurence Steinberg of Temple University told The Wall Street Journal. Truth. In the same article, Jennifer Tanner, co-chair of the Society for the Study of Emerging Adulthood, provides her own pearl: "My advice is, if your parents are currently doing things for you that you could do for yourself, take the controls. Say, 'No. Mom, Let me get my own shampoo.'" Thanks for the tip, Ms. Tanner. I mean, if I were living at home to save money, I wouldn't mind sharing the jumbo size 2-in-1 shampoo and conditioner with my siblings. But I'm pretty sure the vast majority of my peers have a handle on shampoo selection by now. Because we're worth it. 006ab0faaa

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