Carl Gustav Jung (1875 - 1961), Swiss psychologist and psychiatrist; one of the mainpsychiatric authorities of his time. He differed from Freud in regarding the libido (energy or driving force) as a will to live rather than a manifestation of the sex instinct, and held that a neurosis is to be understood more by analysis of the patient's present problem and inadequate adjustment than by unearthing childhood fixations and conflicts. He divided all men into two classesN introverts and extroverts. See also Freud in this glossary.—Grad V Approved 1992 Glossary Upgrade