Discrimination learning without reward.
D000818:Animals; D001921:Brain / Q000502:physiology; D004193:Discrimination Learning; D004292:Dominance, Cerebral; D005556:Form Perception; D000882:Haplorhini; D008251:Macaca; D009799:Ocular Physiological Phenomena; D012055:Reinforcement Schedule; D012201:Reward; D014796:Visual Perception