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Durable Lessons on Intelligence from Twin and Adoption Research.

Emily A Willoughby¹, Tobias Edwards², James J Lee²

¹Department of Psychology, University of Minnesota Twin Cities, Minneapolis, USA. willo074@umn.edu.

Behavior Genetics

|May 20, 2026

Summary

This summary is machine-generated.

Behavioral genetics research shows that cognitive ability heritability increases with age, while shared environmental influences decrease. New findings address selective placement in adoption studies, crucial for understanding genetic and environmental impacts on intelligence.

Keywords:

Adoption studies Cognitive ability Polygenic scores Social mobility

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Area of Science:

Behavioral Genetics
Human Cognitive Abilities
Quantitative Genetics

Background:

Matt McGue's research has established intelligence as a key model for behavioral genetics.
Early work demonstrated substantial heritability of cognitive ability, with increasing genetic influence from childhood to adulthood.
Shared environmental effects on cognitive ability diminish over the lifespan.

Purpose of the Study:

To review the accomplishments of Matt McGue in behavioral genetics research on intelligence.
To present new findings on selective placement in adoption studies.
To examine the correlations between parental phenotypes and polygenic scores of adopted offspring.

Main Methods:

Utilized twin and kinship studies to assess heritability of cognitive ability and educational attainment.
Extended adoption methods to investigate genetic and environmental contributions to social mobility.
Analyzed selective placement by correlating parental phenotypes with offspring polygenic scores in adoption designs.

Main Results:

Cognitive ability heritability increases with age, while shared environmental effects decrease.
Cognitive ability, noncognitive traits, and family background all influence educational attainment and social mobility.
New results address selective placement, examining its impact on genetic and environmental influence estimates.

Conclusions:

Behavioral genetics provides significant explanatory power for cognitive abilities.
Adoption study methodologies, including addressing selective placement, are critical for valid genetic and environmental inference.
Higher education benefits individuals across the ability spectrum.