title: Aspects of a comparative psychology of mental deficiency.
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D002415:Cats; D002657:Child Development; D000882:Haplorhini; D015186:Hominidae; D006801:Humans; D008607:Intellectual Disability; D008425:Maternal Behavior; D008960:Models, Psychological; D011587:Psychology, Comparative; D012106:Research