The contribution of therapeutic instructions to systematic desensitization.
D000293:Adolescent; D000328:Adult; D000818:Animals; D001521:Behavior Therapy; D003071:Cognition; D005260:Female; D006801:Humans; D008875:Middle Aged; D010698:Phobic Disorders / Q000628:therapy*; D011336:Probability; D012911:Snakes