Cited by 754Autism Spectrum Disorder ResearchSexual Differentiation and DisordersGenetics and Neurodevelopmental Disorders

Why are autism spectrum conditions more prevalent in males?

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Baron-Cohen, Simon, Lombardo, Michael V., Auyeung, Bonnie, Ashwin, Emma, Chakrabarti, Bhismadev, Knickmeyer, Rebecca·2011·PLoS Biology

Abstract

Autism Spectrum Conditions (ASC) are much more common in males, a bias that may offer clues to the etiology of this condition. Although the cause of this bias remains a mystery, we argue that it occurs because ASC is an extreme manifestation of the male brain. The extreme male brain (EMB) theory, first proposed in 1997, is an extension of the Empathizing-Systemizing (E-S) theory of typical sex differences that proposes that females on average have a stronger drive to empathize while males on average have a stronger drive to systemize. In this first major update since 2005, we describe some of the evidence relating to the EMB theory of ASC and consider how typical sex differences in brain structure may be relevant to ASC. One possible biological mechanism to account for the male bias is the effect of fetal testosterone (fT). We also consider alternative biological theories, the X and Y chromosome theories, and the reduced autosomal penetrance theory. None of these theories has yet been fully confirmed or refuted, though the weight of evidence in favor of the fT theory is growing from converging sources (longitudinal amniocentesis studies from pregnancy to age 10 years old, current hormone studies, and genetic association studies of SNPs in the sex steroid pathways). Ultimately, as these theories are not mutually exclusive and ASC is multi-factorial, they may help explain the male prevalence of ASC.

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  1. [1]A.P.A 1994 DSM-IV diagnostic and statistical manual of mental disorders, 4th edition Washington DC American Psychiatric Association
  2. [36]Hines M 2004 Brain gender Oxford & New York Oxford University Press

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Authors
Baron-Cohen, S., Lombardo, M. V., Auyeung, B., Ashwin, E., Chakrabarti, B., & Knickmeyer, R.
Affiliations
  • University of Cambridge (GB)
  • University of North Carolina at Chapel Hill (US)
Venue
PLoS Biology
Published
2011-06-14
Volume
9
Issue
6
Pages
e1001081
ISSN
  • 1544-9173 (ISSN-L)
  • 1545-7885
OpenAlex
W2089020381
Cited by
754
References
276
Citations by year
2026: 20 · 2025: 28 · 2024: 51 · 2023: 45 · 2022: 69 · 2021: 48 · 2020: 104 · 2019: 37 · 2018: 49 · 2017: 37 · 2016: 63 · 2015: 57 · 2014: 47 · 2013: 55 · 2012: 43
FWCI
3.94
Type
journal article
Language
en
Open access
Locations
  • PLoS Biology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, other-oa)
Funders
  • Wellcome Trust
  • National Institute for Health and Care Research
  • Medical Research Council
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Sexual Differentiation and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
autism spectrum disorder, sex differences, male bias, extreme male brain theory, empathizing-systemizing theory, sex differences in brain structure, fetal testosterone, autism etiology
MeSH terms
Brain, Child, Child Development Disorders, Pervasive, Female, Humans, Male, Pregnancy, Testosterone, Prevalence, Polymorphism, Single Nucleotide

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