Figure 3.

Prisoner’s dilemma. (A),(E),(I),(M), and (Q) show scatter plots of final decisions in the $x_1{x}_2$-plane, where subjects’ actions are expected to cluster around the single pure Nash equilibrium located in the top-right corner at position (1,1). (B),(F),(J),(N), and (R) show two-dimensional histograms binning the experimental scatter plots. (C),(G),(K),(O), and (S) represent the change of the mean endpoints (averaged for both players) for each trial across the block of 40 trials. (D),(H),(L),(P), and (T) show the direction of adaptation in the endpoint space. The experimental data is shown at the top, the four continuous models are shown below. Created using MATLAB R2021a (https://www.mathworks.com)⁴³.