The founder of analytic psychology, Carl Gustav Jung, developed the concept of the autonomous and unconscious complex and the technique of free association. Jung explained human behavior as a combination of four psychic functions: thinking, feeling, intuition and sensation. He coined the term "synchronicity," the coincidence of causally unrelated items having identical or similar meanings. He used this as an explanation for extrasensory events traditionally thought to be occult. Jung was born on this date in 1875 and died in 1961.

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