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. 2017 Sep 14;7(10):e00807. doi: 10.1002/brb3.807

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© 2017 The Authors. Brain and Behavior published by Wiley Periodicals, Inc.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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An example of each the four trial types: (a) prosocial giving (giving to the experimenter does not impact the participant's own winnings on that trial), (b) selfless giving (giving to the experimenter decreases the participant's winning on that trial), (c) catch trials 1 (there is one choice that is advantageous to both the participant and the experimenter), and (d) catch trials 2 (there is one choice that is advantageous to the participant without impacting the experimenter's winnings on that trial)