Why and when justice sensitivity leads to pro- and antisocial behavior

People differ in how injustice-sensitive they are either as victims or as observers. Whereas observer sensitivity is positively related to cooperative behavior, victim sensitivity promotes antisocial and egoistic behavior. The present article investigates the dynamics underlying these effects. Participants played an online-based public goods game and were informed about the number of people who violated a fairness rule in previous rounds of the game (no, some, or many violators). High victim-sensitive participants contributed less to the public good even in the some violators condition. High observer-sensitive participants contributed more to the public good even in the many violators condition. The findings correspond with the sensitivity to mean intentions model and cannot be explained by individual differences in general trust. (C) 2009 Elsevier Inc. All rights reserved.