Genetic Relatedness, Emotional Closeness and Physical Aggression: A Comparison of Full and Half Sibling Experiences
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 con...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
PsychOpen GOLD/ Leibniz Institute for Psychology
2020-03-01
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| Series: | Europe's Journal of Psychology |
| Subjects: | |
| Online Access: | https://ejop.psychopen.eu/index.php/ejop/article/view/1620 |
| _version_ | 1797968825733349376 |
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| author | Roxanne Khan Gayle Brewer John Archer |
| author_facet | Roxanne Khan Gayle Brewer John Archer |
| author_sort | Roxanne Khan |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T02:52:45Z |
| format | Article |
| id | doaj.art-29af0f2d787c40f48d03ef3d6df6174c |
| institution | Directory Open Access Journal |
| issn | 1841-0413 |
| language | English |
| last_indexed | 2024-04-11T02:52:45Z |
| publishDate | 2020-03-01 |
| publisher | PsychOpen GOLD/ Leibniz Institute for Psychology |
| record_format | Article |
| series | Europe's Journal of Psychology |
| spelling | doaj.art-29af0f2d787c40f48d03ef3d6df6174c2023-01-02T16:00:43ZengPsychOpen GOLD/ Leibniz Institute for PsychologyEurope's Journal of Psychology1841-04132020-03-0116116718510.5964/ejop.v16i1.1620ejop.v16i1.1620Genetic Relatedness, Emotional Closeness and Physical Aggression: A Comparison of Full and Half Sibling ExperiencesRoxanne Khan0Gayle Brewer1John Archer2School of Psychology, University of Central Lancashire, Preston, United KingdomSchool of Psychology, University of Liverpool, Liverpool, United KingdomSchool of Psychology, University of Central Lancashire, Preston, United KingdomTwo 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.https://ejop.psychopen.eu/index.php/ejop/article/view/1620family violenceconflicthamilton’s rulesibling violenceweapon use |
| spellingShingle | Roxanne Khan Gayle Brewer John Archer Genetic Relatedness, Emotional Closeness and Physical Aggression: A Comparison of Full and Half Sibling Experiences Europe's Journal of Psychology family violence conflict hamilton’s rule sibling violence weapon use |
| title | Genetic Relatedness, Emotional Closeness and Physical Aggression: A Comparison of Full and Half Sibling Experiences |
| title_full | Genetic Relatedness, Emotional Closeness and Physical Aggression: A Comparison of Full and Half Sibling Experiences |
| title_fullStr | Genetic Relatedness, Emotional Closeness and Physical Aggression: A Comparison of Full and Half Sibling Experiences |
| title_full_unstemmed | Genetic Relatedness, Emotional Closeness and Physical Aggression: A Comparison of Full and Half Sibling Experiences |
| title_short | Genetic Relatedness, Emotional Closeness and Physical Aggression: A Comparison of Full and Half Sibling Experiences |
| title_sort | genetic relatedness emotional closeness and physical aggression a comparison of full and half sibling experiences |
| topic | family violence conflict hamilton’s rule sibling violence weapon use |
| url | https://ejop.psychopen.eu/index.php/ejop/article/view/1620 |
| work_keys_str_mv | AT roxannekhan geneticrelatednessemotionalclosenessandphysicalaggressionacomparisonoffullandhalfsiblingexperiences AT gaylebrewer geneticrelatednessemotionalclosenessandphysicalaggressionacomparisonoffullandhalfsiblingexperiences AT johnarcher geneticrelatednessemotionalclosenessandphysicalaggressionacomparisonoffullandhalfsiblingexperiences |