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. 2006 Oct 9;103(42):15623–15628. doi: 10.1073/pnas.0604475103

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© 2006 by The National Academy of Sciences of the USA

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Fig. 1. — Donation task and behavioral results. (a) Task design. The name and mission statement of an ORG was presented, followed by the payoff type (decision phase), and then by the outcome phase. Depending on the trial, Yes or No decisions to different payoff types had different monetary consequences to the participant and/or to the ORG (“outcome types”; see Materials and Methods and Figs. 5–8). In this example, a (YOU: $0 ORG: $+5) payoff is shown. (b) The conditions of interest derived from the main outcome types and comprised costly opposition [red; No to (YOU: $+2 ORG: $+5)], noncostly opposition [orange; No to (YOU: $0 ORG: $+5)], costly donation [dark blue; Yes to (YOU: $−2 ORG: $+5)], noncostly donation [light blue; Yes to (YOU: $0 ORG: $+5)], and pure monetary reward [green; Yes to (YOU: $+2 ORG: $0)]. Altruistic or costly decisions included costly donation and costly opposition.