title: Predictable vs. unpredictable shock: preference behavior and stomach ulceration.
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D001362:Avoidance Learning; D001835:Body Weight; D003216:Conditioning, Operant; D004326:Drinking; D004597:Electroshock; D005239:Fear; D005508:Food Deprivation; D006799:Housing, Animal; D006801:Humans; D008124:Locomotion; D008297:Male; D008954:Models, Biological; D010775:Photic Stimulation; D011336:Probability; D051381:Rats; D013276:Stomach Ulcer; D013315:Stress, Psychological