title: Success of covert negative reinforcement is not the result of operant conditioning.
mesh_terms: D000818:Animals; D001521:Behavior Therapy / Q000379:methods*; D003216:Conditioning, Operant; D005239:Fear; D005260:Female; D006801:Humans; D007092:Imagination; D008297:Male; D012054:Reinforcement, Psychology; D012911:Snakes