title: COMPLEX VISUAL CONCEPT IN THE PIGEON.
abstract: Pigeons were trained to respond to the presence or absence of human beings in photographs. The precision of their performances and the ease with which the training was accomplished suggest greater powers of conceptualization than are ordinarily attributed to animals.
mesh_terms: D000818:Animals; D001717:Birds; D010856:Columbidae; D003210:Concept Formation; D004193:Discrimination Learning; D012106:Research
keywords: BIRDS; DISCRIMINATION LEARNING; EXPERIMENTAL LAB STUDY