The term comorbid is used to deny that there is any relationship between Autism Disorders, particularly Autistic Disorder and Intellectual Disability. The Neurodiversity ideological movement disdains any mention of Intellectual Disability in connection with "Autism" which is romanticized and its reality as a mental disorder downplayed. "Autism" research is routinely conducted using participants with Aspergers and HFA, those with Autistic Disorder and Intellectual Disability are excluded.
The DSM-5 will continue the process of separating Intellectual Disability from Autistic Disorder without any apparent regard as to whether an imporant element of autism disorders ... the relationship between ID and Autistic Disorder will be ignored to the possible long term detriment to persons with Autistic Disorder and ID and to our understanding of "autism" and Intellectual Disabilities. Following are some starting sources for consideration of this important issue.
Autism and intellectual disability: a study of prevalence on a sample of the Italian population.
Psychiatry Unit, Department of Neurological and Psychiatric Sciences, University of Florence, Hospital of Careggi, Florence, Italy. email@example.com
AbstractBACKGROUND: In 1994, the American Association on Mental Retardation with the DSM-IV has come to a final definition of pervasive developmental disorders (PDD), in agreement with the ICD-10. Prevalence of PDD in the general population is 0.1-0.15% according to the DSM-IV. PDD are more frequent in people with severe intellectual disability (ID). There is a strict relationship between ID and autism: 40% of people with ID also present a PDD, on the other hand, nearly 70% of people with PDD also have ID. We believe that in Italy PDD are underestimated because there is no agreement about the classification system and diagnostic instruments.
METHOD: Our aim is to assess the prevalence of PDD in the Italian population with ID. The Scale of Pervasive Developmental Disorder in Mentally Retarded Persons (PDD-MRS) seems to be a very good instrument for classifying and diagnosing PDD.
RESULTS: The application of the PDD-MRS and a clinical review of every individual case on a sample of 166 Italian people with ID raised the prevalence of PDD in this population from 7.8% to 39.2%.
CONCLUSIONS: The study confirms the relationship between ID and autism and suggests a new approach in the study of ID in order to elaborate a new integrated model for people with ID.
Definition: Autism is a pervasive developmental disorder, first identified by Kanner in 1943. Decades later, Autism came to be viewed as the more severe of the Autism Spectrum Disorders (ASD) which also include Asperger’s Disorder. ASD is a heterogeneous disorder that includes a range of developmental impairments in the areas of social skills, verbal and non-verbal communication as well as restricted or repetitive interests or behaviours.
Symptoms and Impairments:
• Cognitive impairment is present in about 80% of persons diagnosed with Autism and
general intellectual functioning is most often below average. Persons diagnosed with
Asperger’s Disorder have average to above average intellectual functioning.
CDC Medical Epidemiologist Dr. Marshalynn Yeargin-Allsopp - CMAJ Interview