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. 2010 Jan 13;5(1):e8483. doi: 10.1371/journal.pone.0008483

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Viana et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Simulated games using TFT and PR were performed using the empirically determined cooperation probabilities after each outcome, T, R, P and S, of the game (see Figure 1d and h). (left panel) Bar graph showing average outcome, rewards and punishments, per session (sum of 20 trials) of the experimental TFT game and, TFT-based simulation against TFT and Random. (right panel) Bar graph showing average outcome, rewards and punishments, per session (sum of 20 trials) of the experimental PR game and, PR-based simulation against TFT and Random. Dashed lines represent the theoretically predicted optimal values for a 20-trial session when the opponent is playing TFT (panel a) and Random (panel b).