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Indeed, there was more within-person variability than between-person variability in extraverted behaviors. The key feature that distinguishes extraverts and introverts was that extraverts tend to act moderately extraverted about 5–10% more often than introverts. From this perspective, extraverts and introverts are not "fundamentally different".
For example, according to type theories, there are two types of people, introverts and extroverts. According to trait theories, introversion and extroversion are part of a continuous dimension with many people in the middle.
Introverts appear to be less responsive than extroverts to dopamine (a brain chemical linked to reward-driven learning), and have a more circumspect and cautious approach to risk than do extroverts. [3] Introverts are more governed by the neocortex, the part of the brain responsible for thinking, planning, language and decision making. [12]
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Finding out if you are introverted or extroverted is one of the most basic personality distinctions that can tell you much about you and your relationship with others.
AOL jobs recently interviewed Wendy Gelberg, president of Gentle Job Search and author of 'The Successful Introvert,' to learn more about the characteristics of introverts and extroverts.
For example, an introvert may feel overwhelmed at a rock concert because she is sensitive to all the stimuli (music, lights, voices, touch etc.) and she is taking all of it in at once, whereas an extrovert is not sensitive and wants to experience these stimuli even more. Cain also notes that temperament is a spectrum rather a definitive extreme.
The term type has not been used consistently in psychology and has become the source of some confusion. Furthermore, because personality test scores usually fall on a bell curve rather than in distinct categories, [6] personality type theories have received considerable criticism among psychometric researchers.