Genetic differences account for about 50% of the variation in measured intelligence (general cognitive ability) among people.
May 01, 2016
high
statistical
This is a population-level heritability estimate derived from twin, adoption and DNA studies summarizing contributions of inherited DNA differences to variation in intelligence.
Estimates of genetic influence on measured intelligence increase with age, with approximate values of 20% in infancy, 40% in childhood, and 60% in adulthood.
May 01, 2016
high
statistical
Reported age-related changes in heritability suggest that genetic contributions to measured cognitive ability become larger across development.