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A Twin Study of the Genetics of High Cognitive Ability Selected from 11,000 Twin Pairs in Six Studies from Four Countries |
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| Authors: | Claire M A Haworth Margaret J Wright Nicolas W Martin Nicholas G Martin Dorret I Boomsma Meike Bartels Danielle Posthuma Oliver S P Davis Angela M Brant Robin P Corley John K Hewitt William G Iacono Matthew McGue Lee A Thompson Sara A Hart Stephen A Petrill David Lubinski Robert Plomin |
| Institution: | 1. Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, King’s College London, De Crespigny Park, Box P080, London, SE5 8AF, UK 2. Queensland Institute of Medical Research, Brisbane, QLD, Australia 3. Department of Biological Psychology, Faculty of Psychology and Education, VU University, Amsterdam, The Netherlands 4. Section Medical Genomics, VU Medical Centre, Amsterdam, The Netherlands 5. Section Functional Genomics, Faculty Earth and Life Science, VU University, Amsterdam, The Netherlands 6. Institute for Behavioral Genetics, University of Colorado at Boulder, Boulder, CO, USA 7. Department of Psychology, University of Minnesota, Minneapolis, MN, USA 8. Department of Psychology, Case Western Reserve University, Cleveland, OH, USA 9. Human Development and Family Science, Ohio State University, Columbus, OH, USA 10. Department of Psychology and Human Development, Vanderbilt University, Nashville, TN, USA |
| Abstract: | 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. Edited by Dick Rose. |
| Keywords: | Genetics High cognitive ability Twins Intelligence Talent |
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