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Which three features together define intellectual disability under the AAMD definition?
ASub-average IQ, perfect adaptive behaviour, with onset in adolescence
BAbove-average IQ, deficits in motor speed, with onset only in old age
CAverage IQ, surplus in adaptive behaviour, with onset only in adulthood
DSub-average intellectual functioning, adaptive deficits, developmental onset
Answer & Solution
Correct answer: D. Sub-average intellectual functioning, adaptive deficits, developmental onset
1. The chapter cites the American Association on Mental Deficiency definition.
2. It points to three basic features of intellectual disability.
3. First: significantly sub-average general intellectual functioning (typically IQ below 70).
4. Second: deficits in adaptive behaviour, the capacity to deal independently with one's environment.
5. Third: the deficits must be observed during the developmental period (between 0 and 18 years).
6. Hence the three AAMD features are sub-average functioning, adaptive deficit, and developmental period onset.
_Source: NCERT Class 12 Psychology Ch 1 "Variations in Psychological Attributes", p. 12, Intellectual Deficiency_
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