The striatum serves as a kind of central dispatch for the brain, relaying commands from areas like the prefrontal cortex, where decisions are made, to an older part of our neurology, the basal ganglia, where movement and emotions emerge. Neurologists believe the striatum helps translate decisions into action and plays an important role in regulating our moods. The damage from the burst vessels inside the apathetic patients’ striata was small—too small, some of Habib’s colleagues said, to explain their behavior changes. Beyond those pinpricks, however, Habib could find nothing else to explain
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