(NEWSER– Just one dose of cocaine may physically change the brain as the body begins "learning addiction," scientists say. They investigated the effect of the drug on mice, and noted that within two hours of being injected with the drug, brain changes were visible, the BBC reports. After two hours, scans showed that mice on the drug developed more dendritic spines—key to forming memories—than did mice injected with water. "Our images provide clear evidence that cocaine induces rapid gains in new spines, and the more spines the mice gain, the more they show they learned about the drug," says a researcher.

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