title: Pavlovian appetitive contingencies and approach versus withdrawal to conditioned stimuli in pigeons.
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D010856:Columbidae; D003214:Conditioning, Classical; D003216:Conditioning, Operant; D004193:Discrimination Learning; D005247:Feeding Behavior; D005260:Female; D009043:Motor Activity; D012054:Reinforcement, Psychology; D014796:Visual Perception