2000/10/01 by Eric Turkheimer · 15 citations
Psychology · #Cognitive Abilities and Testing #Child and Animal Learning Development
paper · doi:10.1111/1467-8721.00084
openalex publication_date 2000/10/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/15
Behavior genetics has demonstrated that genetic variance is an important component of variation for all behavioral outcomes, but variation among families is not. These results have led some critics of behavior genetics to conclude that heritability is so ubiquitous as to have few consequences for scientific understanding of development, while some behavior genetic partisans have concluded that family environment is not an important cause of developmental outcomes. Both views are incorrect. Genotype is in fact a more systematic source of variability than environment, but for reasons that are methodological rather than substantive. Development is fundamentally nonlinear, interactive, and difficult to control experimentally. Twin studies offer a useful methodological shortcut, but do not show that genes are more fundamental than environments.