Monday, September 25, 2017

All psychological traits show significant and substantial genetic influence

From Top 10 Replicated Findings From Behavioral Genetics by Robert Plomin, et al.

No knowledge is certain and all knowledge is always contingent. Social sciences and psychology are particularly weak in terms of reliability of findings and replication. So take it with a pinch of salt, but this is an interesting list of the most replicated findings in behavioral genetics.
Finding 1. All psychological traits show significant and substantial genetic influence

Finding 2. No traits are i00% heritable

Finding 3. Heritability is caused by many genes of small effect

Finding 4. Phenotypic correlations between psychological traits show significant and substantial genetic mediation

Finding 5. The heritability of intelligence increases throughout development

Finding 6. Age-to-age stability is mainly due to genetics

Finding 7. Most measures of the "environment" show significant genetic influence

Finding 8. Most associations between environmental measures and psychological traits are significantly mediated genetically

Finding 9. Most environmental effects are not shared by children growing up in the same family

Finding 10. Abnormal is normal (Quantitative genetic methods suggest that common disorders are the extremes of the same genetic factors responsible for heritability throughout the distribution.)


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