2009 Fiscal Year Final Research Report
Genetic and Environmental influences on social behavior : A study from Evolutionary Psychology and Behavior Genetics.
| Project/Area Number |
19730384
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Social psychology
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| Research Institution | Kyoto University |
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Principal Investigator |
HIRAISHI Kai Kyoto University, こころの未来研究センター, 助教 (50343108)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 遺伝と環境 / 進化 / 個人差 / 経済ゲーム / 公共財ゲーム / 双生児研究 |
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| Research Abstract |
Genetic and environmental influences on individual differences in economic game was studied with twin sample. We constructed a web-based survey system on which participants took part in a public goods game with the strategy method. The web-study with 282 twins revealed relatively small genetic and common-environmental effects on the response to non-cooperative group members. When other members were cooperative, the responses were influenced by genetic and/or common environmental influences to a certain degree. We also proposed the internal environment theory of personality, which explains the maintenance of genetic variation in personality through natural selection. Based on the hypothesis, we demonstrated that the level of trust towards strangers are influenced by the level of extraversion and agreeableness.
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