A well-known investigation which found that identical twins, whether raised together or apart, exhibit a higher correlation between their IQ scores than siblings or fraternal twins raised together. This revealed a genetic component to intelligence.

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Investigations used to determine the heritability of intelligence. By comparing the IQ score correlations of different sibling pairs, such as identical twins raised together versus apart, researchers can identify genetic components.

Twin Studies in Intelligence Research

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

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