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Why do some people get addicted while others remain immune to the lure of drugs? Neuroscientists have been studying this question for years, asking whether the difference arises from particular variations in brain structure. But until now the research has not been clear on whether the brain changes seen in addiction are a cause or the result of excessive drug use.
A new study of siblings published Thursday in Science suggests that at least some of the brain differences come first. The study compared cognitive function and brain structure of 47 people with addiction, with 49 of their nonaddicted siblings and 50 healthy unrelated and drug-free volunteers./.../
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