Moving beyond intelligence in the revision of ICD-10: specific cognitive functions in intellectual developmental disorders
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2014
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World Psychiatry
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University of Cape Town
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A lower level of intelligence, as measured by IQ, has historically been the central defining criterion of mental retardation (MR). The use of IQ scores in terms of standard deviation units from the mean is the basis for defining MR in the ICD-10 and DSM-IV-TR, and more recently for defining intellectual disability (ID) in the DSM-5. Similarly, ID is defined by the American Association on Intellectual and Developmental Disabilities as an IQ score approximately two standard deviations below the mean (1). However, in recent years, an increasing number of researchers and clinicians have expressed the view that measurements of IQ fail to capture individual differences in cognitive dysfunction. The heterogeneity of cognitive dysfunction and consequent adaptive behavior profile in persons with MR is one of the reasons leading the working group in charge of this issue within the revision of the ICD-10 to propose a new definition for intellectual developmental disorders (IDD) in the upcoming 11th edition of the diagnostic system (2).
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Bertelli, M. O., Salvador-Carulla, L., Scuticchio, D., Varrucciu, N., Martinez-Leal, R., Cooper, S., . . . Walsh, C. (2014). Moving beyond intelligence in the revision of ICD-10: specific cognitive functions in intellectual developmental disorders. World Psychiatry, 13(1), 93-94. doi:10.1002/wps.20094