Figure 2.

Results of human-human pairings in the Block Dilemma

(A) The percentage of rounds across all pairings that resulted in each category of round outcome.

(B) Cooperation rates per round over all pairings, with the top plot showing the percentage of interactions resulting in Efficient Cooperation and the bottom plot showing the percentage of interactions resulting in either Efficient or Aloof Cooperation. For better visualization, fitted lines show a linear model of the data, with shaded areas representing 95% confidence intervals of the model's fit.

(C) The outcome of each of the 15 rounds of each pairing. For example, in Pairing #2 (no communication), player 1 dominated player 2 in the first three rounds, followed by Aloof Cooperation in the remaining 12 rounds. In Pairings #11–14 (unrestricted communication), the players efficiently cooperated (by taking turns getting the squares) through all 15 rounds of the interactions.