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Progress in Understanding the Causes of Autism Spectrum Disorders and Autistic Traits: Twin Studies from 1977 to the Present Day

Part of the Advances in Behavior Genetics book series (AIBG,volume 2)

Abstract

Researchers continue to pursue a better understanding of the symptoms, comorbidities, and causes of autism spectrum disorders. In this chapter, we review the twin studies of autism spectrum disorders (ASDs) and autistic traits that have contributed to this endeavor. These twin studies have reported on the heritability of ASDs and autistic traits in different populations and using different measurement and age groups. These studies reveal that the etiology of clinical autism and autistic traits assessed in the general population is more similar than different, which contributes to the question of where the boundary lies between ASD and typical development. These studies have also stimulated debates and new hypotheses regarding what causes ASDs; their comorbidity with intellectual disability, language delay, and psychiatric disorders such as ADHD; and why ASDs show substantial symptom heterogeneity. Lastly, methodological assumptions of the twin design are given consideration in relation to autism research. We conclude with suggesting a range of future research directions for studying ASDs and related phenotypes.

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Notes

  1. 1.

    Case studies of single twin pairs with ASD have been omitted from this review. Although case studies are useful at a descriptive level, statistical results cannot be derived from individual pairs.

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Ronald, A., Hoekstra, R. (2014). Progress in Understanding the Causes of Autism Spectrum Disorders and Autistic Traits: Twin Studies from 1977 to the Present Day. In: Rhee, S., Ronald, A. (eds) Behavior Genetics of Psychopathology. Advances in Behavior Genetics, vol 2. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9509-3_2

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