Figure 1.

(a) Mean cooperation rate across all strategies in the final generation varied based on level of skew in contact pattern (no skew, low skew, high skew), forgetting rate (λ specifies starting point, ψ specifies decay rate) and type of memory error (guessing or skipping). Each agent experienced 100 interactions spread across 10 partners. Shaded area highlights the empirically derived forgetting parameters. Standard error of the mean error bars are not shown because they are smaller than the data point symbols. (b) Mean cooperation rate across all strategies in the final generation varied based on the number of interactions that partners experienced (100, 200, 500 and 1500) and contact pattern skew for the λ = 0.87, ψ = 0.22 skipping condition. (Online version in colour.)