College of Criminology and Criminal Justice, Florida State University, 634 W. Call Street, Tallahassee, FL 32306-1127, USA.
J Neural Transm (Vienna). 2013 Mar;120(3):477-86. doi: 10.1007/s00702-012-0881-0. Epub 2012 Aug 23.
Although research findings have revealed that both genetic and environmental factors contribute to variation in IQ at the individual level, no studies have examined how genetic differences contribute to differences in IQ within and between families. The current study uses data drawn from the National Longitudinal Study of Adolescent Health (Add Health) to examine the potential role genetic factors play in shaping differences in IQ scores within and between families. The results revealed that while genetic variation between family members did not significantly predict differences in IQ scores, family-level dopaminergic risk scores did significantly predict differences in family-level IQ. The implications of the results are elaborated upon, and suggestions for future research are discussed.
虽然研究结果表明，个体的智商差异既受遗传因素又受环境因素的影响，但目前尚无研究探讨遗传差异如何导致个体内部和个体之间家庭的智商差异。本研究利用全国青少年健康纵向研究（Add Health）的数据，考察了遗传因素在塑造个体内部和个体之间智商差异方面的潜在作用。结果表明，虽然家庭成员之间的遗传变异并不能显著预测智商分数的差异，但家庭层面的多巴胺风险评分确实显著预测了家庭层面的智商差异。对结果的意义进行了阐述，并讨论了未来研究的建议。
