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Is There a Genetic Correlation Between General Factors of Intelligence and Personality?

  • John C. Loehlin (a1), Meike Bartels (a2), Dorret I. Boomsma (a2), Denis Bratko (a3), Nicholas G. Martin (a4), Robert C. Nichols (a5) and Margaret J. Wright (a4)...

We tested a hypothesis that there is no genetic correlation between general factors of intelligence and personality, despite both having been selected for in human evolution. This was done using twin samples from Australia, the United States, the Netherlands, Great Britain, and Croatia, comprising altogether 1,748 monozygotic and 1,329 same-sex dizygotic twin pairs. Although parameters in the model-fitting differed among the twin samples, the genetic correlation between the two general factors could be set to zero, with a better fit if the U.S. sample was excepted.

Corresponding author
address for correspondence: John C. Loehlin, Psychology Department, University of Texas, 1 University Station A8000, Austin, Texas, 78712, USA. E-mail:
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Twin Research and Human Genetics
  • ISSN: 1832-4274
  • EISSN: 1839-2628
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