Genetic variation accounts for a significant portion of individual differences in human intelligence test scores.
the verdict
SUPPORTED
the evidence backs this
confidence 81/100
Multiple behavioral genetic studies and twin designs indicate that genetic variation accounts for a substantial and increasing proportion of individual differences in human intelligence test scores.
Evidence for · 5
Heritability of Intelligence
2007 · cited by 9
Discusses twin study findings showing significant heritability estimates for children's cognitive ability.
See more details
More for · 4
Genetic foundations of human intelligence.
2009 · cited by 0
Summarizes literature showing that the heritability of intelligence is substantial and increases from childhood into adulthood.
Genetics of brain structure and intelligence.
2005 · cited by 0
Notes that general cognitive ability (g) is highly heritable across many behavioral and brain-mapping studies.
Genetic influences on brain structure.
2001 · cited by 0
Reports genetic mapping and brain structure findings linked to Spearman's g test performance.
Genetic and Environmental Influences on Cognitive Abilities in Extreme Poverty.
2019 · cited by 0
Observes substantial genetic influence (30-40%) on cognitive abilities even within populations experiencing extreme poverty.