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date: 07 July 2020

Abstract and Keywords

Intellectual disability (ID) and autism spectrum disorder (ASD) are two neurodevelopmental disorders noted to have a high degree of overlap and co-occurrence. Historically, symptoms of ID were reported to co-occur in approximately 70% or more of those with ASD; however, the rate of co-occurrence is now believed to be around 30%. As the perceptions and diagnostic conceptualization of each condition by itself have changed over time, our knowledge of the overlap and the relationship between ID and ASD has similarly changed. This chapter provides a brief overview of the relationship between ID and ASD and focuses more on the complexities and nuances pertaining to etiology, diagnosis, and assessment of symptoms that may covary or may differentially occur. Finally, the chapter provides a summary of current evidence-based interventions for use in those who have ASD and co-occurring ID, as well as a look toward future directions for investigation.

Keywords: intellectual disability, autism spectrum disorder, differential diagnosis, co-occurring

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