title: Commentary on papers by Detlev Ploog and Ursula Belugi.
mesh_terms: D000818:Animals; D001921:Brain / Q000502:physiology*; D002663:Child Language; D003243:Consciousness / Q000502:physiology; D004292:Dominance, Cerebral / Q000502:physiology; D000882:Haplorhini; D006801:Humans; D007223:Infant; D007804:Language Development; D007858:Learning / Q000502:physiology; D011578:Psycholinguistics; D012453:Saimiri / Q000502:physiology; D012813:Sign Language; D013045:Species Specificity; D014828:Vocalization, Animal / Q000502:physiology*