The ecological determinants of reinforcement in the rat.
D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001069:Appetite Regulation; D001835:Body Weight; D003216:Conditioning, Operant; D004326:Drinking; D004435:Eating; D005247:Feeding Behavior; D008297:Male; D009042:Motivation; D051381:Rats; D012054:Reinforcement, Psychology; D013997:Time Factors