A school of ‘analytical psychology’, first described by Carl Gustav Jung in 1913. It introduced the concepts of introvert (turned in on oneself) and extrovert (outgoing) personalities, and developed the theory of the ‘collective unconscious’ with its archetypes of man's basic psychic nature. In contrast with Freudian analysis (see FREUDIAN THEORY), in Jungian analysis the relationship between therapist and patient is less one-sided because the therapist is more willing to be active and to reveal information about him or herself. (See also PSYCHOANALYSIS.)