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New map of the brain’s action centre upends textbook theory.

Think about a person performing a simple action, when they reach for a pan of brownies, a ball-shaped brain structure called the striatum is critical for controlling their movement toward the reward. A healthy striatum also helps a person stop when they’ve had enough; however, when the striatum misfunctions, it can lead to disorders such as Parkinson’s disease, obsessive-compulsive disorder

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