Concept usage research with the mentally retarded.
D000293:Adolescent; D000328:Adult; D001244:Association; D001288:Attention; D001925:Brain Damage, Chronic; D002648:Child; D003210:Concept Formation; D003463:Cues; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics; D007360:Intelligence; D008297:Male; D014706:Verbal Learning