Khan Roxanne, Brewer Gayle, Archer John
School of Psychology, University of Central Lancashire, Preston, United Kingdom.
School of Psychology, University of Liverpool, Liverpool, United Kingdom.
Eur J Psychol. 2020 Mar 3;16(1):167-185. doi: 10.5964/ejop.v16i1.1620. eCollection 2020 Mar.
Two studies investigated whether perceived closeness of siblings, and aggression between siblings, were associated with genetic relatedness. In following Hamilton's rule, we predicted that as the coefficient of relatedness between siblings increased, emotional closeness would also increase while conflict would decrease. Contrary to the predictions, we found no effect of genetic relatedness in Study 1 when we compared participants' (n = 240) ratings of emotional closeness; participants also reported significantly higher levels of conflict with full siblings than with half siblings. In Study 2, participants (n = 214) also reported a higher frequency of physical aggression with full siblings than with half siblings. These findings were contrary to the prediction from Hamilton's rule. We discuss them in relation to parental investment in biological and non-biological offspring.
两项研究调查了兄弟姐妹之间感知到的亲密程度以及兄弟姐妹之间的攻击性是否与基因关联性有关。遵循汉密尔顿法则，我们预测随着兄弟姐妹之间的亲缘系数增加，情感亲密程度也会增加，而冲突会减少。与预测相反，在研究1中，当我们比较参与者（n = 240）对情感亲密程度的评分时，未发现基因关联性的影响；参与者还报告称，与同胞兄弟姐妹发生冲突的程度显著高于同父异母或同母异父的兄弟姐妹。在研究2中，参与者（n = 214）也报告称，与同胞兄弟姐妹发生身体攻击的频率高于同父异母或同母异父的兄弟姐妹。这些发现与汉密尔顿法则的预测相反。我们将结合父母对亲生孩子和非亲生孩子的投入来讨论这些发现。
