Loehlin J C
Hum Genet. 1980;55(3):297-302. doi: 10.1007/BF00290207.
At least a half-dozen adoption studies of intelligence or related traits (such as socioeconomic status) have been reported in the past three or four years. They have yielded somewhat divergent findings, but the majority of the studies continue to provide evidence of a substantial genetic contribution to family resemblance in IQ. The recent studies have generally reported lower overall correlations among family members than were obtained in the classical adoption studies. The restricted IQ range in the samples of the recent studies may be responsible for this difference.
在过去三四年里，至少有六项关于智力或相关特质（如社会经济地位）的收养研究被报道。这些研究得出了一些不同的结果，但大多数研究仍继续提供证据，表明智商方面的家族相似性有很大的遗传因素。最近的研究普遍报告称，家庭成员之间的总体相关性低于经典收养研究中的结果。近期研究样本中智商范围受限可能是造成这种差异的原因。
