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. 2020 Sep 11;10:14959. doi: 10.1038/s41598-020-71919-6

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© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2020

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Participants’ cooperation rates, self-reports of joy, and expectations of cooperation in the iterated prisoner’s dilemma. (A) Cooperation rate was influenced by emotion expressions with the generosity strategy, but not with the extortion strategy. Error bars show standard errors. (B) Cooperation across rounds. (C) Participants reported the most joy with the generosity strategy and the least joy with the extortion strategy. Error bars show standard errors. (D) Expectations of cooperation for each condition.