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Intelligence - nature or nurture? Researchers find a gene for intelligence and also that a bigger brain matters, yet other recent articles show how motivation affects learning.

Cocaine changes brain, makes relapse more common in addicts

Cocaine use causes 'profound changes' in the brain that lead to an increased risk of relapse due to stress, according to new research that identifies a molecular mechanism in the reward centre of the brain that influences how recovering cocaine addicts might relapse after stressful events. Importantly, the study identifies a potential mechanism for protecting against such relapses with treatment.
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