title: Drive level, incentive conditions and systematic densensitization.
mesh_terms: D000293:Adolescent; D000328:Adult; D001521:Behavior Therapy; D004328:Drive; D005108:Extinction, Psychological; D006801:Humans; D010698:Phobic Disorders / Q000628:therapy; D012054:Reinforcement, Psychology; D012063:Relaxation; D012201:Reward