The exaggerated dopamine sensitivity of the introvert leads one to believe that when in public, introverts, regardless of its validity, often feel to be the center of (unwanted) attention hence rarely craving attention. Extroverts, on the other hand, seem to never get enough attention. So on the flip side it seems as though the introvert is in a sense very external and the extrovert is in a sense very internal - the introvert constantly feels too much 'outerness' while the extrovert doesn't feel enough 'outerness'.