The effect of intergroup status on ingroup cooperation among Japanesebaseball fans.

ヤキュウ　ファン　ノ　ナイシュウダン　キョウリョク　ニ　シュウダンカン　チイ　ガ　オヨボス　エイキョウ

ナカガワ, ユミ

Nakagawa, Yumi

オオサカ ダイガク ダイガクイン ニンゲン カガク ケンキュウカ タイジン シャカイ シンリガク ケンキュウシツ

社会的アイデンティティ理論

閉ざされた一般互酬仮説

実在集団

ingroup cooperation

Social Identity Theory

Bounded Generalized Reciprocity Hypothesis

real groups

In this study, we compared the ability of both the Social Identity Theory (SIT) and Bounded Generalized Reciprocity Hypothesis (BGR) to explain ingroup cooperation in real groups. We conducted the vignette experiments that were designed as controlling various confounded factors to possibility influence ingroup cooperation among Japanese baseball fans. In the experiment, we manipulated expectation of reciprocity, which was assumed as a precursor of ingroup cooperation by BGR, by controlling knowledge of group membership. Ingroup cooperation was measured by participants' intent of helping a stranger in four scenarios. According to Nakagawa et al. (2015, submitted), cost of ingroup cooperation can enhanced the psychological process of BGR, while ingroup cooperation without cost proceeds both processes of theories. However, these experiments were unclear intergroup differences and the effect of social identity was weak. Thus, we expressed the stimulus of intergroup status by the perceptual priming to clear intergroup differences. But the result of the experiment was not support the effect of intergroup status. The analysis that the effect of status was removed revealed both theories was not supported.