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Diagnosis and Subclassification of Autism

Concepts and Instrument Development

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Diagnosis and Assessment in Autism

Part of the book series: Current Issues in Autism ((CIAM))

Abstract

Since Kanner first described the syndrome of autism in 1943, there has been substantial progress in the diagnosis and classification of the disorder (see chapter by Rutter and Schopler, this volume). As a result, both ICD-9 (World Health Organization, 1978) and DSM-III (American Psychiatric Association, 1980), the two major systems of psychiatric classification, broadly agree on the main features to be taken into account in diagnosis. In essence, the main weight is placed on a particular type of deviance in language, a particular type of deviance in social relationships, and particular patterns of repetitive and stereotyped behaviour, together with developmental abnormalities that have been evident from before the age of 30 months. The recently published guidelines for DSM-III-R (American Psychiatric Association, 1987) and the draft guidelines for ICD-10 (World Health Organization, 1987) follow the same general principles, although both have attempted to provide somewhat greater specification on the patterns of abnormality in these areas that are thought to be most characteristic of autism. In addition, because of practical difficulties in the application of the 30-month cutoff for developmental abnormalities, this has been raised to 3 years of age. Most of the published interview, questionnaire, and observational methods of assessment (see Rutter and Schopler, Chapter 2, this volume) have focused similarly on these diagnostic features, although they differ somewhat in their emphasis. Most have been primarily concerned with the diagnosis of autism in mentally handicapped children, as the majority of autistic individuals show some degree of mental retardation. The instruments have been developed with the main aim of making diagnoses for treatment purposes or for decisions on placement in different service facilities. The instruments work reasonably well in meeting these objectives, but there are now new purposes that require some modification in methods of assessment. This chapter describes some measures developed to meet these emerging needs.

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Rutter, M., LeCouteur, A., Lord, C., Macdonald, H., Rios, P., Folstein, S. (1988). Diagnosis and Subclassification of Autism. In: Schopler, E., Mesibov, G.B. (eds) Diagnosis and Assessment in Autism. Current Issues in Autism. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0792-9_16

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  • DOI: https://doi.org/10.1007/978-1-4899-0792-9_16

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