Journal
BEHAVIOR GENETICS
Volume 39, Issue 4, Pages 359-370Publisher
SPRINGER
DOI: 10.1007/s10519-009-9262-3
Keywords
Genetics; High cognitive ability; Twins; Intelligence; Talent
Funding
- John Templeton Foundation [13575]
- US National Institute of Child health and Human Development [HD038075, HD046167, HD44454, HD46167]
- The Twins Early Development Study (United Kingdom): UK Medical Research Council [G0500079]
- Minnesota Twin Family Study (USA): USPHS [AA009367, R01 DA005147, R01 DA013240]
- Colorado Twin Studies (USA): LTS [HD19802, HD010333, HD18426, MH043899]
- MacArthur Foundation
- CTS: [VA1296.07.1629B, DA011015]
- MRC [G0500079, G19/2] Funding Source: UKRI
- Medical Research Council [G0500079, G9817803B, G19/2] Funding Source: researchfish
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Although much genetic research has addressed normal variation in intelligence, little is known about the etiology of high cognitive abilities. Using data from 11,000 twin pairs (age range = 6-71 years) from the genetics of high cognitive abilities consortium, we investigated the genetic and environmental etiologies of high general cognitive ability (g). Age-appropriate psychometric cognitive tests were administered to the twins and used to create g scores standardized within each study. Liability-threshold model fitting was used to estimate genetic and environmental parameters for the top 15% of the distribution of g. Genetic influence for high g was substantial (0.50, with a 95% confidence interval of 0.41-0.60). Shared environmental influences were moderate (0.28, 0.19-0.37). We conclude that genetic variation contributes substantially to high g in Australia, the Netherlands, the United Kingdom and the United States.
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