Figure 3. Task performance measured as the median number of pucks collected by the population per 1,000 time-steps.

Plots show results for monee with and without market mechanism and with random parent selection (i.e., without any referral to the number of pucks collected–medea). The vertical bars indicate the 95% confidence interval for the medians. The robots clearly adapt behaviour to collect pucks. The number of pucks collected barely differs whether the market mechanism is in force or not. With random parent selection, the robots gather far fewer pucks: collection is a result of accidentally running over them during random movement.