Figure 3
From: Nature of collective decision-making by simple yes/no decision units
Simulation results showing how collective decisions are affected by differences in the number of units allocated to options. (a) A high proportion of correct choices with a large number of units. (b) Reduction in the number of correct choices according to increased standard deviation of the number of units allocated to each option (σ m ). (c,d) Quorum decision improving the correct choice performance under such variation in the number of units among options. With variance in the number of units (σ m = 30), decision-making by quorum decision exceeds that by majority decision, whereas with no variance (σ m = 0), quorum decision is always inferior to the majority decision. The results with 10 options are shown. Black, grey, and white regions indicate correct choices, quorum not reached, and incorrect choices, respectively. Red lines indicate the proportion of correct choices by majority decision. (e,f) Outcome of binary choices between options A and B (black bars) and ternary choices among options A, B and DA (grey bars) with the collective (majority) decision (e) and individual decisions (f). The parameters that are not analysed here are set as default values in Table S1.
