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The nature and nurture of high IQ : an extended sensitive period for intellectual development
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Brant, Angela M., Munakata, Yuko, Boomsma, Dorret I., Defries, John C., Haworth, Claire M. A., Keller, Matthew C., Martin, Nicholas G., McGue, Matthew, Petrill, Stephen A., Plomin, Robert, Wadsworth, Sally J., Wright, Margaret J. and Hewitt, John K. (2013) The nature and nurture of high IQ : an extended sensitive period for intellectual development. Psychological Science, Volume 24 (Number 8). pp. 1487-1495. doi:10.1177/0956797612473119 ISSN 1467-9280.
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Official URL: http://dx.doi.org/10.1177/0956797612473119
Abstract
IQ predicts many measures of life success, as well as trajectories of brain development. Prolonged cortical thickening observed in individuals with high IQ might reflect an extended period of synaptogenesis and high environmental sensitivity or plasticity. We tested this hypothesis by examining the timing of changes in the magnitude of genetic and environmental influences on IQ as a function of IQ score. We found that individuals with high IQ show high environmental influence on IQ into adolescence (resembling younger children), whereas individuals with low IQ show high heritability of IQ in adolescence (resembling adults), a pattern consistent with an extended sensitive period for intellectual development in more-intelligent individuals. The pattern held across a cross-sectional sample of almost 11,000 twin pairs and a longitudinal sample of twins, biological siblings, and adoptive siblings.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Psychology | ||||
Journal or Publication Title: | Psychological Science | ||||
Publisher: | Sage Publications Ltd. | ||||
ISSN: | 1467-9280 | ||||
Official Date: | August 2013 | ||||
Dates: |
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Volume: | Volume 24 | ||||
Number: | Number 8 | ||||
Page Range: | pp. 1487-1495 | ||||
DOI: | 10.1177/0956797612473119 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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