Word: risk
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...axons, that make up white matter. Myelination of axons begins during childhood and is completed at the end of adolescence, around the mid-20s. Myelination in the frontal lobe - the brain region responsible for decision-making - happens last, and it was in this region that the brains of risk-seeking teens in the study showed greater development compared with the frontal lobes of their more restrained peers. (See pictures of the college dorm's evolution...
...paper just published in PLoS ONE - a journal of the Public Library of Science - a team led by psychiatrist Gregory Berns of Emory University in Atlanta shows that adolescents who engage in more dangerous activities have white-matter pathways that appear more mature than those of risk-averse youths. White matter is essentially the brain's wiring - the neural strands that connect the various gray-matter regions, where the actual nerve cells reside, that are otherwise independent of one another. Maturation of white matter is important because it increases the brain's processing speed; nerve impulses travel faster in mature...
...imaging that is used to look at dense tissues like white matter. After analyzing the scans, the authors found a strong correlation between how risky the students described their behavior to be and how sophisticated their white matter was. The more mature the look of the brain, the more risk-taking the teenager tended to report...
...would kids who take more risks turn out to have more adultlike white matter than other kids? The authors suggest that some risk-taking among adolescents is evidence that they are trying out more adultlike roles. Having unsafe sex and driving too fast may be mistakes, but kids often have to experiment with limits in order to learn how to live within them. Which, in turn, is a sign of maturity. "Adolescents who engage in [risky] behaviors obtain more experience in a variety of domains," the authors write. "Their more conservative peers, in contrast, do not have as much 'life...
...maintaining Britain's good ties with Gaddafi is clear in the letters, as when Straw explained why he chose not to exclude al-Megrahi from a prisoner-transfer agreement between Britain and Libya that was signed in November 2008. "I do not believe it is necessary, or sensible, to risk damaging our wide ranging and beneficial relationship with Libya," he wrote, before signing off, "Yours, Jack...