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12 Ss in an experimental group were led to believe that they had harmed another person, while 14 Ss in a control group were not. All Ss were then given an opportunity to engage in altruistic behavior toward a 3rd party, in the form of agreeing to donate blood to a local hospital. By this measure the experimental group was more altruistic than the control group at the. 026 level (2-tailed).(PsycINFO Database Record (c) 2016 APA, all rights reserved)