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Psychoanalysis and behaviorism lead to the conclusion that lust and rage, described as the two primary human emotions from which other emotions are
derived, represent and stem from man's earliest (paleolithic) adaptation to the rhythms of his primitive life. Physiologic and psychologic (libidinal) correlates are linked to their anatomic 'headquarters' and apparatus in the brain and sympathetic and parasympathetic nervous systems. The author suggests that the primary emotions are an adaptation to the activities and functions of the external rhythms of night and day.