Predictable and unpredictable shock: their pathological effects on restrained and unrestrained rats.
D000818:Animals; D001835:Body Weight; D003214:Conditioning, Classical; D003213:Conditioning, Psychological; D004597:Electroshock; D005239:Fear; D007103:Immobilization; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D013276:Stomach Ulcer