Before revision: A study of Dutch twins concludes that intelligence of a 5 year old is 26%DIF < heritability, while the test scores of a 12-year-old is 64% based on heritability.
After revision: A study of Dutch twins concludes that intelligence of a 5 year olds is 26%DIF < heritbility, while the test scores of a 12-year-old is 64% based on heritability.