Development of language, abstraction, and numerical concept formation in Down's syndrome children.
D000124:Achievement; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D003118:Color Perception; D003210:Concept Formation; D004192:Discrimination, Psychological; D004314:Down Syndrome; D005556:Form Perception; D006801:Humans; D007361:Intelligence Tests; D007804:Language Development; D011581:Psychological Tests; D013850:Thinking; D014705:Verbal Behavior; D014706:Verbal Learning