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Adolescents' brains respond differently than adults' when anticipating rewards
Date:1/17/2012

PITTSBURGHTeenagers are more susceptible to developing disorders like addiction and depression, according to a paper published by Pitt researchers Jan. 16 in the Proceedings of the National Academy of Sciences.

The study was led by Bita Moghaddam, coauthor of the paper and a professor of neuroscience in Pitt's Kenneth P. Dietrich School of Arts and Sciences. She and coauthor David Sturman, a MD/PhD student in Pitt's Medical Scientist Training Program, compared the brain activity of adolescents and adults in rats involved in a task in which they anticipated a reward. The researchers found increased brain cell activity in the adolescent rats' brains in an unusual area: the dorsal striatum (DS)a site commonly associated with habit formation, decision-making, and motivated learning. The adult rats' DS areas, on the other hand, did not become activated by an anticipated reward.

"The brain region traditionally associated with reward and motivation, called the nucleus accumbens, was activated similarly in adults and adolescents," said Moghaddam. "But the unique sensitivity of adolescent DS to reward anticipation indicates that, in this age group, reward can tap directly into a brain region that is critical for learning and habit formation."

Typically, researchers study the correlation between different behaviors of adolescents and adults. The Pitt team, however, used a method they call "behavioral clamping" to study if the brains of adolescents process the same behavior differently. To that end, the researchers implanted electrodes into different regions of rat adolescent and adult brains, allowing the researchers to study the reactions of both individual neurons and the sum of the neurons', or "population," activity.

The researchers' predictions proved accurate. Even though the behavior was the same for both adult and adolescent rats, the researchers observed age-related neural response differences that were especially dr
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Contact: B. Rose Huber
rhuber@pitt.edu
412-624-4356
University of Pittsburgh
Source:Eurekalert

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