Behavior Genetics

, Volume 20, Issue 4, pp 545–546

The heritability of intelligence in Japan


  • Richard Lynn
    • University of Ulster
  • Ken Hattori
    • National Rehabilitation Center for the Disabled

DOI: 10.1007/BF01067719

Cite this article as:
Lynn, R. & Hattori, K. Behav Genet (1990) 20: 545. doi:10.1007/BF01067719


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

intelligencetwinsheritabilityJapanprenatal nutritionbirth weight
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Copyright information

© Plenum Publishing Corporation 1990