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Los seres humanos poseen una estructura cerebral y psicológica que nos permite aprender diferentes lenguas (en algunos seres humanos que han sufrido lesiones cerebrales o padecen un retraso mental severo esta capacidad está inhibida o no ha podido ser desarrollada). Los homínidos superiores parecen ser el único grupo de especie que ha podido desarrollar un lenguaje con estructura sintáctica estricta. A pesar de que ha logrado enseñarse código de signos a primates estos muestran un conocimiento de los fundamentos [[semántica lingüística|semánticos]] del lenguaje pero no de los [[sintaxis|sintácticos]]. Y aunque es posible que algunas especies de homínidos diferentes del homo sapiens sapiens hubieran desarrollado un lenguaje con sintaxis, no existe una evidencia que corrobore esto.
