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Quote from DSM-5:

C. Onset of intellectual and adaptive deficits during the developmental period
(Page 33: Diagnostic criteria for Intellectual Disability [Intellectual Development Disorder]).

[...] In acquired forms, the onset may be abrupt following an illness such as meningitis or encephalitis or head trauma occurring during the developmental period.
(Page 38: Development and Course)

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    $\begingroup$ Welcome to Psychology.SE. Can you please provide more information on what you don't quite understand from what you have read? Also, when quoting, please can you be more specific on where you are quoting from, espectially when quotes concern different pages and different context. $\endgroup$ – Chris Rogers Oct 16 '20 at 12:45
  • $\begingroup$ When looking at the DSM, Page 40 also states "Intellectual disability is categorized as a neurodevelopmental disorder and is distinct from the neurocognitive disorders, which are characterized by a loss of cognitive functioning. Major neurocognitive disorder may co-occur with intellectual disability (e.g., an individual with Down syndrome who develops Alzheimer's disease, or an individual with intellectual disability who loses further cognitive capacity following a head injury). In such cases, the diagnoses of intellectual disability and neurocognitive disorder may both be given." $\endgroup$ – Chris Rogers Oct 16 '20 at 12:51
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    $\begingroup$ Also, directly after the quote from Page 38, it states "When intellectual disability results from a loss of previously acquired cognitive skills, as in severe traumatic brain injury, the diagnoses of intellectual disability and of a neurocognitive disorder may both be assigned." $\endgroup$ – Chris Rogers Oct 16 '20 at 12:55
  • $\begingroup$ What I have a doubt on is what it would be classified as when an adult develops a neurocognitive disorder leading to a learning disability. It would be diagnosed as a neurocognitive disorder, but what label would they use to explain the intellectual disability, because I.D. can only be developed during the developmental period? $\endgroup$ – Vivaciete Freeman Oct 16 '20 at 16:49

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