Gastric ulcers in the rat as a function of the temporal relationship between punishment and reward.
D000818:Animals; D003216:Conditioning, Operant; D003220:Conflict, Psychological; D004597:Electroshock; D005247:Feeding Behavior; D008297:Male; D011678:Punishment; D051381:Rats; D012055:Reinforcement Schedule; D012201:Reward; D013276:Stomach Ulcer / Q000209:etiology*; D013997:Time Factors