title: Hearing of old world monkeys (Cercopithecinae).
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D001299:Audiometry; D001309:Auditory Threshold; D005075:Biological Evolution; D003216:Conditioning, Operant; D000882:Haplorhini / Q000502:physiology*; D006309:Hearing; D012054:Reinforcement, Psychology