title: [In-group bias in trusting behavior: a choice of allocator experiment with minimal groups].
abstract: 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.
authors.affiliation: Department of Behavioral Science, Graduate School of Letters, Hokkaido University, Kita-ku, Sapporo 060-0810, Japan. suzuki@lynx.let.hokudai.ac.jp
authors.forename: Naoto
authors.initials: N
authors.lastname: Suzuki
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Konno
authors.forename: Toshio
authors.initials: T
authors.lastname: Yamagishi
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006126:Group Processes; D006801:Humans; D007398:Interpersonal Relations; D008297:Male; D011287:Prejudice; D012201:Reward; D035502:Trust / Q000523:psychology*