Figure 3.

(Left panel) Mean RT to reach the quorum Q = 0.8 for the best option as a function of the number of options n. Different coloured lines correspond to varying decision difficulty κ (see Sec. 5.2). The SSA data (points) are fitted with curves of Eq. (5) (light dot-dashed lines), with curves of Eq. (7) (solid lines), and with curves of Eq. (7) using f_μ(κ) (dashed thick lines) (see Supplementary Table S2). (Right panel) Mean RT decreases as a power law with the signalling ratio r. The SSA data (points) are fitted with the curve $\mathrm{RT}=z_2{r}^{-z_1}$. The inset shows a power law increase ($\mathrm{RT}=m_1+m_2{\kappa }^{m_3}$) of RT as a function of the problem difficulty κ. Vertical bars show the variance.