The Wilson Effect: The Increase in Heritability of IQ With Age

@article{Bouchard2013TheWE,
  title={The Wilson Effect: The Increase in Heritability of IQ With Age},
  author={Thomas J. Jr. Bouchard},
  journal={Twin Research and Human Genetics},
  year={2013},
  volume={16},
  pages={923 - 930}
}
  • T. Bouchard
  • Published 7 August 2013
  • Psychology
  • Twin Research and Human Genetics
Ronald Wilson presented the first clear and compelling evidence that the heritability of IQ increases with age. We propose to call the phenomenon ‘The Wilson Effect’ and we document the effect diagrammatically with key twin and adoption studies, including twins reared apart, that have been carried out at various ages and in a large number of different settings. The results show that the heritability of IQ reaches an asymptote at about 0.80 at 18–20 years of age and continuing at that level well… 
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References

SHOWING 1-10 OF 93 REFERENCES
The heritability of general cognitive ability increases linearly from childhood to young adulthood
TLDR
It is shown for general cognitive ability that, to the contrary, genetic influence increases with age, and this finding suggests new ways of thinking about the interface between nature and nurture during the school years.
Differences in genetic and environmental influences on the human cerebral cortex associated with development during childhood and adolescence
TLDR
The observation that regions associated with complex cognitive processes such as language, tool use, and executive function are more heritable in adolescents than children is consistent with previous studies showing that IQ becomes increasingly heritable with maturity.
Genetic influences on cognitive functions in the elderly: A selective review of twin studies
Dramatic Increase in Heritability of Cognitive Development from Early to Middle Childhood
TLDR
Despite increasing importance of genetic influences and declining influence of shared environment, similar genetic and shared environmental factors affect g from early to middle childhood, as indicated by a cross-age genetic correlation of .57 and a shared environmental correlation of%.
Heritability of cognitive abilities in adult twins: Comparison of Minnesota and Swedish data
TLDR
Heritability estimates and the factor structure of cognitive abilities could be equated across younger twins and middle-aged twins from both studies, suggesting stability of heritability during adulthood.
The Louisville Twin Study: developmental synchronies in behavior.
TLDR
The overall results pointed to a strong developmental thrust in the growth of intelligence, which was principally guided by an intrinsic genetic ground plan, and Qualitative features of home and family did not add significantly to prediction of offspring IQ.
Intelligence: new findings and theoretical developments.
TLDR
The relationship between working memory and intelligence, the apparent contradiction between strong heritability effects on IQ, whether a general intelligence factor could arise from initially largely independent cognitive skills, the relation between self-regulation and Cognitive skills, and the effects of stress on intelligence are reported.
Genetic influence on human intelligence (Spearman's g): How much?
TLDR
The application of ‘strong inference’, via the use of structural equation models in the domain of human intelligence, is described, and its utility is demonstrated as a means of refuting well formulated scientific hypotheses.
...
...