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Extroverts may be more outgoing and cheerful in part because of their brain chemistry, reports a study by Cornell neuroscientists. People’s brains respond differently to rewards, say the neuroscientists. Some people’s brains release more of the neurotransmitter dopamine, which ultimately gives them more reasons to be excited and engaged with the world, says Richard Depue, professor of human development in the College of Human Ecology, who co-authored the study with graduate student Yu Fu.
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