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According to Berns, DTI technology takes advantage of the fact that water molecules tend to move along myelin pathways. Subjects were also screened for actual drug use, which was predicted well by test scores. White matter consists of myelin, a fatty substance that coats the long axons, which carry brain signals; its main function is to increase the efficiency of neural signaling. At least two observations undermine this theory, however. A study being published tomorrow turns that thinking upside down: It suggests that the brains of many teens who behave dangerously are maturing early:



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iam sample man take everything easy looking for kind lady to share life Hi.. I'm a happily married woman looking for a female to have a little fun with. I am also looking for an addition to play with my husband and I. The brains of teens who behave dangerously are more like adult brains than are those of their more cautious peers. White matter consists of myelin, a fatty substance that coats the long axons, which carry brain signals; its main function is to increase the efficiency of neural signaling. First, American-style teen turmoil is absent in more than cultures around the world, suggesting that such mayhem is not biologically inevitable.

Nobody denies that the brain develops or that teens take risks, but how the two got intertwined is beyond me. Now neuroscientists Gregory S. Gazzaniga of the University of California, Santa Barbara, one of the pioneers in modern neuroscience, sees the Berns study more positively.


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The large number of subjects makes the results hard to ignore, he says, and they need to be taken seriously. In an immature brain, water throughout the brain diffuses in a roughly spherical, cloudlike pattern, but as the brain matures and myelin "tracts" form and grow around axons, water starts to move along those tracts in patterns that the imaging technique picks up as lines radiating throughout the brain. Not everyone thinks the new study will overturn thinking about the teenage brain.
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