Why many teenagers seek thrills, break rules and seem nonchalant about their own safety has been a question brain scientists have worked to answer in the last two decades. A new study in the journal “Nature” found that structural changes in adolescents' brains correspond to fluctuations in IQ over time, with some young people improving and some falling back on these tests. Research from the National Institutes of Health has shown, the prefrontal cortex, a region of the brain associated with inhibition of risky behavior, doesn't get fully developed until age 25.
http://www.cnn.com/2011/10/19/health/mental-health/teen-brain-impulses/index.html
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