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Researchers demonstrated this phenomenon by giving Ritalin — the ADHD drug that stimulates dopamine production in the brain — to introverted and extroverted college students. They found that extroverts were more likely to associate the feeling of euphoria achieved by the rush of dopamine with the environment they were in. Introverts, by contrast, did not connect the feeling of reward to their surroundings. The study “suggests that introverts have a fundamental difference in how strongly they process rewards from their environment, with the brains of introverts weighing internal cues more strongly than external motivational and reward cues,” explained LiveScience’s Tia Ghose.