Developmental versus difference theories of mental retardation and the problem of motivation.
D002648:Child; D002657:Child Development; D003071:Cognition; D006801:Humans; D008607:Intellectual Disability / Q000209:etiology* / Q000235:genetics; D007360:Intelligence; D007361:Intelligence Tests; D009042:Motivation; D011582:Psychological Theory; D013997:Time Factors