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The Validity of Psychiatric Diagnoses: The Case of "Specific" Developmental Disorders
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Dyck, Murray J.; Piek, Jan P.; Patrick, Jeff – Research in Developmental Disabilities: A Multidisciplinary Journal, 2011
We tested whether developmental coordination disorder (DCD) and mixed receptive expressive language disorder (RELD) are valid diagnoses by assessing whether they are separated from each other, from other childhood disorders, and from normality by natural boundaries termed zones of rarity. Standardized measures of intelligence, language, motor…
Descriptors: Attention Deficit Hyperactivity Disorder, Mental Retardation, Autism, Social Cognition