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the claim

Introversion and extraversion are primarily determined by genetic rather than environmental factors

the verdict

SUPPORTED

the evidence backs this

confidence 80/100

Twin and genetic studies consistently demonstrate that personality traits, including extraversion and introversion, are substantially shaped by genetic factors rather than solely environmental ones.

Evidence for · 2

Bridging temperament and the Big Five in children: A genetically informative study.

2024 · cited by 5

Demonstrates substantial heritability estimates for childhood personality traits including extraversion.

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More for · 1

The relationship between personality throughout adolescence and social anxiety disorder in young adulthood. A longitudinal twin study.

2024 · cited by 1

Shows that links between personality and behavioral outcomes are primarily driven by shared genetic influences.

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first checked01 Aug 2026

judged → SUPPORTED · 8001 Aug 2026

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