Carl Jung
Extraversion and introversion

Jung was one of the first people to define introversion and extraversion in a psychological context. In Jung's Psychological Types, he theorizes that each person falls into one of two categories: the introvert or the extravert. Jung compares these two psychological types to ancient archetypes, Apollo and Dionysus. The introvert is likened to Apollo, who shines a light on understanding. The introvert is focused on the internal world of reflection, dreaming, and vision. Thoughtful and insightful, the introvert can sometimes be uninterested in joining the activities of others. The extravert is associated with Dionysus, interested in joining the activities of the world. The extravert is focused on the outside world of objects, sensory perception, and action. Energetic and lively, the extravert may lose their sense of self in the intoxication of Dionysian pursuits. Jungian introversion and extraversion is quite different from the modern idea of introversion and extraversion. Modern theories often stay true to behaviourist means of describing such a trait (sociability, talkativeness, assertiveness, etc.), whereas Jungian introversion and extraversion are expressed as a perspective: introverts interpret the world subjectively, whereas extraverts interpret the world objectively.
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