title: The effect of sign language on picture naming in two retarded girls possessing normal hearing.
mesh_terms: D002648:Child; D004314:Down Syndrome / Q000534:rehabilitation; D004495:Education of Persons with Intellectual Disabilities; D005260:Female; D006309:Hearing; D006801:Humans; D007360:Intelligence; D007804:Language Development; D008369:Manual Communication; D012153:Retention, Psychology; D012813:Sign Language; D014706:Verbal Learning