Chronic fear produced by unpredictable electric shock.
D000818:Animals; D003216:Conditioning, Operant; D004597:Electroshock; D005239:Fear; D006801:Humans; D008297:Male; D051381:Rats; D013276:Stomach Ulcer / Q000209:etiology*; D013315:Stress, Psychological; D013997:Time Factors