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Pychology behind quiet, introverted people Levels of introversion/extroversion can be explained by a psychological theory called the Arousal Theory . This theory states that humans have preset levels of arousal in their brains, called the natural level of arousal. However, for some people, their natural level of arousal is too high or too low, which motivates them to seek their optimal level of arousal. Some people’s natural level of arousal is too high, which motivates them to seek calmer, more relaxed activities to lower their brain arousal to an optimal level, whereas some people’s natural level of arousal is low, motivating them to seek out busy, adventurous activities to increase their brain arousal to an optimal level. How does this relate to introverts and extroverts? Introverts’ natural level of brain arousal is already high, so they seek out calm activities to lower it to an optimal level. These activities usually involve staying inside and being alone or around fe...