Behavior Genetics

, Volume 20, Issue 4, pp 545–546

The heritability of intelligence in Japan

  • Richard Lynn
  • Ken Hattori


Japanese data for 543 monozygotic (MZ) twins and 134 dizygotic (DZ) twins tested for intelligence at the age of 12 give correlation coefficients of. 782 and .491, respectively, indicating a heritability of .582. Heavier twins at birth have significantly higher IQs at the age of 12, suggesting that prenatal nutrition exerts a significant effect on intelligence.

Key Words

intelligence twins heritability Japan prenatal nutrition birth weight 


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Copyright information

© Plenum Publishing Corporation 1990

Authors and Affiliations

  • Richard Lynn
    • 1
  • Ken Hattori
    • 2
  1. 1.University of UlsterColeraineNorthern Ireland
  2. 2.National Rehabilitation Center for the DisabledTokorozawaJapan

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