Friday, Jul 24, 2026 The claims desk. Receipts included. POWERED BY LENZ ↗
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SCIENCE

The Claim

The size of a specific brain region correlates with a person's gender identity.

Verified by Lenz ·

The Short Version

Evidence supports a limited version of this statement: some studies have found that the size of particular brain regions is associated with gender identity or gender-diverse traits. But the effect is not consistent across studies, no single region serves as a reliable marker, and some influential findings come from small or confounded samples.

Caveats

  • Do not interpret this as meaning there is one brain region that determines or diagnoses gender identity.
  • Several widely cited findings come from small post-mortem or heterogeneous imaging samples and may be affected by hormone exposure and other confounders.
  • The evidence is region-specific and population-specific; results do not generalize cleanly across all transgender, cisgender, or gender-diverse people.

The Receipts

  1. The Neuroanatomy of Transgender Identity: Mega-Analytic Findings From the ENIGMA Transgender Persons Working Group

    PubMed

  2. Structural, Functional, and Metabolic Brain Differences as a Function of Gender Identity and Sexual Orientation: A Review

    PubMed Central

  3. A sex difference in the hypothalamic uncinate nucleus: relationship to gender identity

    Brain (Oxford Academic)

  4. A sex difference in the hypothalamic uncinate nucleus: relationship to gender identity

    PubMed

  5. Brain Sex in Transgender Women Is Shifted towards Gender Identity

    PubMed Central

  6. Structural connections in the brain in relation to gender identity and sexual orientation

    Nature

  7. Sex Dimorphism of the Brain in Male-to-Female Transsexuals

    Cerebral Cortex

  8. Brain Sex Differences Related to Gender Identity Development

    Frontiers in Neuroscience (PMC)

  9. Gender Diversity and Brain Morphology Among Adolescents

    JAMA Network Open

  10. Structural, Functional, and Metabolic Brain Differences as a Function of Gender Identity or Sexual Orientation: A Systematic Review of the Magnetic Resonance Imaging Literature

    PubMed Central (Frontiers in Neuroscience)

+ 20 more sources — see the full list on Lenz

Filed Under

Gender Identity

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