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the claim

General intelligence factor scores are influenced by a combination of genetic and environmental factors

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

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Extensive twin and behavioral genetic research consistently supports the conclusion that general intelligence is shaped by a complex interplay of both genetic and environmental factors.

The analysis

The retrieved literature consistently confirms that individual differences in general intelligence and cognitive abilities are influenced by a combination of genetic factors (as demonstrated by twin and polygenic studies showing high heritability) and environmental factors (which contribute significantly, particularly in early development and via gene-environment interplay). No papers refute the claim.

Evidence for · 4
Explaining the Increasing Heritability of Cognitive Ability Across Development
Recorded source metadata

Daniel A. Briley, Elliot M. Tucker-Drob. Explaining the Increasing Heritability of Cognitive Ability Across Development. 2013. https://doi.org/10.1177/0956797613478618

Paper 2 demonstrates through a meta-analysis of longitudinal behavioral genetic studies that genetic influences account for increasing proportions of variation in cognitive ability across development.

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More for · 3
Mechanisms of developmental change in genetic and environmental influences on intelligence
Recorded source metadata

Damien Matthew Morris, Stuart James Ritchie, Robert Plomin. Mechanisms of developmental change in genetic and environmental influences on intelligence. 2024. https://doi.org/10.31234/osf.io/uqybg

Paper 5 confirms that general intelligence shows substantial heritability that increases from childhood to adolescence alongside environmental influences.

Cognitive reserve in non-affective first-episode psychosis: contributions of polygenic scores, early clinical features, and environment.
Recorded source metadata

Forte MF, Segura ÀG, Serra-Navarro M, Mezquida G, Torrent C, Gonzalez-Peñas J, Mas S, Vieta E, Andreu-Bernabeu A, Cuesta MJ, Mané A, de la Serna E, Allott K, Bernardo M, Amoretti S. Cognitive reserve in non-affective first-episode psychosis: contributions of polygenic scores, early clinical features, and environment.. 2026. https://doi.org/10.1017/s0033291725101360

Paper 8 shows that cognitive reserve and intelligence-related constructs are significantly shaped by a combination of genetic polygenic scores and environmental factors.

Genetic contribution to intrinsic functional connectivity underlying general intelligence: evidence from adult twin study.
Recorded source metadata

Guragai B, Jin Z, Amos TJ, Zhang Q, Zhang J, Li L. Genetic contribution to intrinsic functional connectivity underlying general intelligence: evidence from adult twin study.. 2025. https://doi.org/10.1093/braincomms/fcaf461

Paper 9 utilizes twin study methodologies to show that functional connectivity patterns linked to general intelligence display significant genetic underpinnings.

The paper trail · every fact has a biography
first checked01 Aug 2026
judged → SUPPORTED · 8901 Aug 2026
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