Training of relative thinking in retardates.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002657:Child Development; D003071:Cognition; D003210:Concept Formation; D004495:Education of Persons with Intellectual Disabilities; D005260:Female; D006801:Humans; D007361:Intelligence Tests; D008297:Male; D008875:Middle Aged; D011581:Psychological Tests; D011582:Psychological Theory; D013850:Thinking