Reliability and constancy of a new measure of intelligence for institutionalized retardates.
D002657:Child Development; D003210:Concept Formation; D004314:Down Syndrome; D006760:Hospitalization; D006801:Humans; D008607:Intellectual Disability; D007360:Intelligence; D007361:Intelligence Tests; D011340:Problem Solving; D011594:Psychometrics; D014796:Visual Perception