Resistance to extinction as a function of differential levels of drive and effortfulness of response.
D000818:Animals; D003216:Conditioning, Operant; D004328:Drive; D005108:Extinction, Psychological; D006815:Hunger; D008297:Male; D005082:Physical Exertion; D051381:Rats; D011930:Reaction Time; D012054:Reinforcement, Psychology