The rationale and irrational in Zigler's motivational approach to mental retardation.
D000367:Age Factors; D003072:Cognition Disorders / Q000150:complications; D003467:Cultural Deprivation; D006801:Humans; D008607:Intellectual Disability / Q000209:etiology; D007360:Intelligence; D009042:Motivation; D011582:Psychological Theory