Instrumental control and ulceration in rats.
D000704:Analysis of Variance; D000818:Animals; D001362:Avoidance Learning; D003216:Conditioning, Operant; D003220:Conflict, Psychological; D004597:Electroshock; D004924:Escape Reaction; D005247:Feeding Behavior; D008297:Male; D051381:Rats; D013276:Stomach Ulcer / Q000209:etiology*