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Sex beyond the genitalia: the human brain mosaic

Joel, Daphna, Berman, Zohar, Tavor, Ido, Wexler, Nadav, Gaber, Olga, Stein, Yaniv, Shefi, Nisan, Pool, Jared, Urchs, Sebastian, Margulies, Daniel S., Liem, Franziskus, Haenggi, Juergen, Jaencke, Lutz and Assaf, Yaniv 2015. Sex beyond the genitalia: the human brain mosaic. Proceedings of the National Academy of Sciences 112 (50) , pp. 15468-15473. 10.1073/pnas.1509654112

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Whereas a categorical difference in the genitals has always been acknowledged, the question of how far these categories extend into human biology is still not resolved. Documented sex/gender differences in the brain are often taken as support of a sexually dimorphic view of human brains (“female brain” or “male brain”). However, such a distinction would be possible only if sex/gender differences in brain features were highly dimorphic (i.e., little overlap between the forms of these features in males and females) and internally consistent (i.e., a brain has only “male” or only “female” features). Here, analysis of MRIs of more than 1,400 human brains from four datasets reveals extensive overlap between the distributions of females and males for all gray matter, white matter, and connections assessed. Moreover, analyses of internal consistency reveal that brains with features that are consistently at one end of the “maleness-femaleness” continuum are rare. Rather, most brains are comprised of unique “mosaics” of features, some more common in females compared with males, some more common in males compared with females, and some common in both females and males. Our findings are robust across sample, age, type of MRI, and method of analysis. These findings are corroborated by a similar analysis of personality traits, attitudes, interests, and behaviors of more than 5,500 individuals, which reveals that internal consistency is extremely rare. Our study demonstrates that, although there are sex/gender differences in the brain, human brains do not belong to one of two distinct categories: male brain/female brain.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Neuroscience and Mental Health Research Institute (NMHRI)
Subjects: R Medicine > R Medicine (General)
Publisher: National Academy of Sciences
ISSN: 0027-8424
Date of First Compliant Deposit: 9 June 2020
Date of Acceptance: 23 October 2015
Last Modified: 05 May 2023 06:48

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