Finkel D, Matheny A P
Indiana University Southeast, New Albany 47150, USA.
Twin Res. 2000 Dec;3(4):242-50. doi: 10.1375/136905200320565210.
A twin study of infant attachment security at age 24 months was conducted on archival data for a sample of 99 MZ pairs and 108 DZ pairs from the Louisville Twin Study. MZ concordance for attachment was 62.6%, which was significantly greater than the DZ concordance of 44.4%. Concordances were transformed into polychoric correlations, and LISREL was used to conduct a quantitative genetic analysis of the data. Results indicated that 25% of the variability in attachment was attributable to genetic factors, and the remaining 75% was attributable to non-shared environmental effects. No evidence was found for a contribution from shared environmental influences to attachment security. Possible concerns about the validity of twin methodology are addressed and various interpretations of the results are presented.
对路易斯维尔双生子研究中99对同卵双胞胎和108对异卵双胞胎样本的档案数据进行了一项关于24个月大婴儿依恋安全性的双生子研究。依恋的同卵双胞胎一致性为62.6%，显著高于异卵双胞胎44.4%的一致性。将一致性转换为多系列相关，并使用LISREL对数据进行定量遗传分析。结果表明，依恋中25%的变异性可归因于遗传因素，其余75%可归因于非共享环境影响。未发现共享环境影响对依恋安全性有贡献的证据。文中讨论了对双生子方法有效性可能存在的担忧，并给出了对结果的各种解释。
