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Young marijuana users respond differently to social exclusion

Young adults who regularly use marijuana display altered brain activation patterns during social exclusion, research indicates. In a recent study, participants played a computerized game of catch while undergoing a non-invasive brain scan. They recruited 42 young adults (ages 18-25), about half of whom regularly used marijuana. Unknown to the study participants, the other 'players' in the game were computers and were programmed to exclude them for a portion of the game.
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