Fig. 2

a The optimal amount of activities: observation (marked with filled ’o’ symbols) and communication (marked with ’x’ symbols), b the fitness values, and c the group accuracy values, as a function of H, for three fake news ratios: 0% (marked with red), 1% (marked with green) and 5%(marked with blue). a The observation activity monotonically increases as a function of H, meaning that members of an optimal group observe proportionally to their abilities. At the same time, at higher H values, the communication activities decrease, at least in case of small fake news ratio. Under exposure to fake news, there is a clear inverse relation between the fake news ratio and the optimal amount of communication. b and c As H increases, the performance of the group also increases, but exposure to fake news deteriorates group-performance severely, for all H values