Module 33: Genetic and Environmental Influences on Intelligence
Genetic Influences
Heritability: the proportion of variation among individuals that we can attribute to genes.
The heritability of a trait may vary, depending on the range of populations and
environments studied.
Environmental Influences
Studies of twins, family members, and adopted children also provide evidence of
environmental influence on intelligence. The intelligence test scores of fraternal twins
raised together are more similar than those of other siblings, and the scores of identical
twins raised apart are less similar (though still very highly correlated) than the scores of
identical twins raised together. Studies of children reared in extremely impoverished,
enriched, or culturally diff environments further indicate the influence of life experiences
on test scores.
Group Differences in Intelligence Test Scores
Ethnic Similarities and Differences
- Race is not a neatly defined biological category.
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- Fall '09
- Ennis
- Psychology, Educational Psychology, intelligence test scores, Genetic and Environmental Influences on Intelligence Genetic Influences
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