Extraversion and introversion are a central trait dimension in human personality theory. The terms were introduced into psychology by Carl Jung, though both the popular understanding and current psych
Twin studies indicate that extraversion-introversion has a genetic component
Myers–Briggs Type Indicator
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The Myers–Briggs Type Indicator is a self-report questionnaire that makes pseudoscientific claims to categorize individuals into 16 distinct psychological types. The test assigns a binary letter value
Extraversion and introversion
…introvert and extravert traits. Quiet author Susan Cain reported studies indicating that 33–50% of the American population are introverts. A 6,000-subject MBTI-based survey in 2016 indicated that 60% of attorneys, and specifically 90% of intellectual property attorneys, were introverts. The extent of extraversion…
Katharine Cook Briggs and Isabel Briggs Myers extrapolated their MBTI theory from Carl Jung's writings in his 1921 book Psychological Types