title: Frequency and duration of hierarchy item exposure in a systematic desensitization analogue.
mesh_terms: D000818:Animals; D001007:Anxiety; D001521:Behavior Therapy; D005239:Fear; D005260:Female; D006801:Humans; D007266:Inhibition, Psychological; D008297:Male; D010698:Phobic Disorders / Q000628:therapy*; D012063:Relaxation; D012649:Self Concept; D012911:Snakes; D013997:Time Factors; D014705:Verbal Behavior