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the claim

The brains of twins exhibit high structural and functional similarity

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

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Extensive twin and neuroimaging studies demonstrate that brain structure and morphology exhibit strong heritability, resulting in high structural and functional similarity in twin brains.

The analysis

Multiple comprehensive meta-analyses and reviews of twin MRI data consistently report high heritability estimates for regional brain volumes, cortical thickness, and overall brain organization, confirming the claim.

Evidence for · 4
Genetic and Environmental Influences on Neuroimaging Phenotypes: A Meta-Analytical Perspective on Twin Imaging Studies
Recorded source metadata

Gabriëlla A. M. Blokland, Greig I. de Zubicaray, Katie L. McMahon, Margaret J. Wright. Genetic and Environmental Influences on Neuroimaging Phenotypes: A Meta-Analytical Perspective on Twin Imaging Studies. 2012. https://doi.org/10.1017/thg.2012.11

Meta-analytic evidence demonstrates that neuroimaging phenotypes, including brain structure and function, are strongly influenced by genetics.

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More for · 3
What Twin Studies Tell Us About the Heritability of Brain Development, Morphology, and Function: A Review
Recorded source metadata

A. Jansen, S. Mous, T. White, D. Posthuma, T. Polderman. What Twin Studies Tell Us About the Heritability of Brain Development, Morphology, and Function: A Review. 2015. https://doi.org/10.1007/s11065-015-9278-9

Review indicates that the majority of investigated brain measures are heritable to a large extent (60-80%), contributing to high morphological similarity between twins.

Structural MRI of brain similarity networks.
Recorded source metadata

Sebenius I, Dorfschmidt L, Seidlitz J, Alexander-Bloch A, Morgan SE, Bullmore E. Structural MRI of brain similarity networks.. 2025. https://doi.org/10.1038/s41583-024-00882-2

Recent work shows that structural MRI similarity effectively maps individual brain networks and reflects genetic architecture.

Twin MRI studies on genetic and environmental determinants of brain morphology and function in the early lifespan.
Recorded source metadata

E. Maggioni, L. Squarcina, N. Dusi, V. Diwadkar, P. Brambilla. Twin MRI studies on genetic and environmental determinants of brain morphology and function in the early lifespan.. 2020. https://doi.org/10.1016/j.neubiorev.2020.01.003

Studies of young twins confirm that global brain morphology and network organization are highly heritable from early childhood to young adulthood.

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first checked01 Aug 2026
judged → SUPPORTED · 9001 Aug 2026
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