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.
Intelligence tests are measures of general cognitive ability and reflect performance across a broad range of cognitive tasks and school-learned skills.
May 01, 2016
high
definitional
The term 'intelligence' as used in research is often operationalized as general cognitive ability measured via diverse standardized tests.