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IQ decline and Piaget: Does the rot start at the top?

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  • Flynn, James R.
  • Shayer, Michael

Abstract

The IQ gains of the 20th century have faltered. Losses in Nordic nations after 1995 average at 6.85 IQ points when projected over thirty years. On Piagetian tests, Britain shows decimation among high scorers on three tests and overall losses on one. The US sustained its historic gain (0.3 points per year) through 2014. The Netherlands shows no change in preschoolers, mild losses at high school, and possible gains by adults. Australia and France offer weak evidence of losses at school and by adults respectively. German speakers show verbal gains and spatial losses among adults. South Korea, a latecomer to industrialization, is gaining at twice the historic US rate.

Suggested Citation

  • Flynn, James R. & Shayer, Michael, 2018. "IQ decline and Piaget: Does the rot start at the top?," Intelligence, Elsevier, vol. 66(C), pages 112-121.
    • Handle: RePEc:eee:intell:v:66:y:2018:i:c:p:112-121
    DOI: 10.1016/j.intell.2017.11.010
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    References listed on IDEAS

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    1. Jakob Pietschnig & Martin Voracek & Anton K Formann, 2010. "Pervasiveness of the IQ Rise: A Cross-Temporal Meta-Analysis," PLOS ONE, Public Library of Science, vol. 5(12), pages 1-6, December.
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    7. Colom, Roberto & García, Luis F. & Shih, Pei Chun & Abad, Francisco J., 2023. "Generational intelligence tests score changes in Spain: Are we asking the right question?," Intelligence, Elsevier, vol. 99(C).
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    9. Hegelund, Emilie R. & Okholm, Gunhild T. & Teasdale, Thomas W., 2021. "The secular trend of intelligence test scores in the present century: The Danish experience," Intelligence, Elsevier, vol. 85(C).
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