著者

鈴木 直人 金野 祐介 山岸 俊男

出版者

公益社団法人 日本心理学会

雑誌

心理学研究 (ISSN:00215236)

巻号頁・発行日

vol.78, no.1, pp.17-24, 2007-04-25 (Released:2010-07-16)

参考文献数

23

被引用文献数

8 9

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The purpose of this study is to show that expectations of generalized reciprocity within one's own group are responsible for in-group trust. To test this hypothesis, an allocator choice game in the minimal group situation was used. We assigned the role of a recipient in a dictator game to all 81 subjects, and measured whether they chose to be a recipient of either an in-group or an out-group “allocator” who freely allocate a fixed reward between him/her and a recipient. The results indicate that in-group trust occurs only in the condition in which recipients know that allocators make a reward allocation knowing the group membership of their recipient; recipients show no preference for either an in-group or an out-group allocator when allocators make the decision without knowing the group membership of their recipient. It is thus shown that participants' in-group trust is derived from the general belief that people treat in-group members more favorably than out-group members—a belief about generalized reciprocity within groups.