Free operant avoidance as a function of the response-shock = shock-shock interval.
D000818:Animals; D001362:Avoidance Learning; D001522:Behavior, Animal; D003216:Conditioning, Operant; D003213:Conditioning, Psychological; D004558:Electric Stimulation; D004597:Electroshock; D008297:Male; D051381:Rats; D013312:Stress, Physiological