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Study Challenges Genetics in Intelligence, Highlights Education Impact

10/12/2025

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Summary

Story summary

Acta Psychologica published a study by Jared C. Horvath and Katie Fabricant analyzing 87 identical twin pairs raised apart.
Among twins with similar schooling, IQ differences average 5.8 points.
Among twins with very dissimilar educational backgrounds, IQ differences average 15.1 points, similar to unrelated individuals.
Horvath and Fabricant say the findings challenge genetics-dominant views of intelligence and demand more individualized case studies.

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Story summary

Acta Psychologica published a study by Jared C. Horvath and Katie Fabricant analyzing 87 identical twin pairs raised apart.
Among twins with similar schooling, IQ differences average 5.8 points.
Among twins with very dissimilar educational backgrounds, IQ differences average 15.1 points, similar to unrelated individuals.
Horvath and Fabricant say the findings challenge genetics-dominant views of intelligence and demand more individualized case studies.