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Neurobiology of Pediatric Gender Identity

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Pediatric Gender Identity

Abstract

Our understanding of the neurobiological basis of gender diversity is limited. Even though more and more neuroimaging studies in adults hint towards sex-atypical and less pronounced sexual differentiation, the picture is far from clear and relatively little is known about the neurobiological correlates of gender incongruence in childhood and youth. In addition, recent studies in adults challenge atypical sexual differentiation of the brain as a sole neurobiological explanation of the condition, also suggesting alterations in brain regions processing self- and body-awareness. Furthermore, the interplay between neurobiological and psychosocial factors in the development of diverse gender identities is poorly understood. In this chapter, we review the literature investigating mechanisms that may underlie gender diversity from a neurobiological perspective. In the first section, we focus on genetic factors that may contribute to gender diverse behaviour and gender identity development. Based on heritability studies, a hypothesis is formulated that there is not one single gene that accounts for the development of gender identity, but many genes are asserted to contribute in addition to other factors that are non-genetic. Next, principles of the prominent sexual differentiation hypothesis of gender incongruence will be discussed. We will summarize the evidence for sex-atypical differentiation of brain function and structure among transgender and gender diverse youth. Moreover, findings with regard to the effects of gender-affirming hormonal treatment on the brain will be presented. We will close the chapter with future directions for research into the neurobiology of gender diversity.

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Correspondence to Baudewijntje P. C. Kreukels .

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Kreukels, B.P.C., Burke, S.M. (2020). Neurobiology of Pediatric Gender Identity. In: Forcier, M., Van Schalkwyk, G., Turban, J. (eds) Pediatric Gender Identity. Springer, Cham. https://doi.org/10.1007/978-3-030-38909-3_4

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