Behavior Genetics

, Volume 20, Issue 4, pp 545–546

The heritability of intelligence in Japan

  • Richard Lynn
  • Ken Hattori
Article

Abstract

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 

References

  1. Bouchard, T. J., and McGue, M. (1981). Familial studies of intelligence: A review.Science 212:1055–1059.Google Scholar
  2. Henrichsen, L., Skinhoj, K., and Andersen, C. E. (1986). Delayed growth and reduced intelligence in 9–17 year old intrauterine growth retarded children compared with their monozygous cotwins.Acta Paediat. Scand. 75:31–35.Google Scholar
  3. Plomin, R., and De Fries, J. C. (1980). Genetics and intelligence: Recent data.Intelligence 4: 15–24.Google Scholar
  4. Takuma, T. (1966). On the early physical conditions influencing the development of intelligence.Jap. J. Psychol. 37:257–267 (in Japanese).Google Scholar
  5. Takuma, T. (1968). An experiment on hereditary influence on intelligence by the twin study method.Jap. J. Educ. Psychol. 16:47–50. (in Japanese).Google Scholar
  6. Willerman, L., and Churchill, J. A. (1967). Intelligence and birth weight in identical twins.Child Dev. 38:623–629.Google Scholar

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

Personalised recommendations