The heritability of intelligence in Japan
- 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.