title: Natural concepts in pigeons.
abstract: Pigeons learned to discriminate pictures of trees, bodies of water, or a particular person in three separate experiments. Pictures being seen for the first time were discriminated almost as well as pictures seen in training. The pigeons in each experiment showed similar patterns of errors and correct discrimination.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D010856:Columbidae; D003216:Conditioning, Operant; D004193:Discrimination Learning; D005556:Form Perception; D005795:Generalization, Stimulus; D008297:Male; D012055:Reinforcement Schedule; D014796:Visual Perception