title: A modified approach to systematic desensitization.
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D001521:Behavior Therapy / Q000379:methods*; D003887:Desensitization, Psychologic / Q000379:methods*; D005239:Fear; D005260:Female; D006339:Heart Rate; D006801:Humans; D009119:Muscle Contraction; D009126:Muscle Relaxation; D012911:Snakes