Incentive theory.
D000818:Animals; D001143:Arousal; D001522:Behavior, Animal; D002648:Child; D010856:Columbidae; D005108:Extinction, Psychological; D005247:Feeding Behavior; D006801:Humans; D008433:Mathematics; D008960:Models, Psychological; D009042:Motivation; D051381:Rats; D012055:Reinforcement Schedule; D013997:Time Factors