SOLUTION OF THE INTERMEDIATE SIZE PROBLEM BY PIGEONS.
D000818:Animals; D001717:Birds; D010856:Columbidae; D004193:Discrimination Learning; D005108:Extinction, Psychological; D012054:Reinforcement, Psychology; D012106:Research; D012858:Size Perception
BIRDS; DISCRIMINATION LEARNING; EXPERIMENTAL LAB STUDY; EXTINCTION (PSYCHOLOGY); REINFORCEMENT (PSYCHOLOGY); SIZE PERCEPTION