Contribution of selective positive reinforcement and therapeutic instructions to systematic desensitization therapy.
D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D000818:Animals; D001521:Behavior Therapy; D005260:Female; D006801:Humans; D010698:Phobic Disorders / Q000628:therapy*; D012057:Reinforcement, Verbal; D012063:Relaxation; D012911:Snakes