Figure 3. Deviations from the rational decision model influence the vaccine uptake levels.

(a) α_V—α_N plane, (b) λ_V,c—λ_N,c plane with λ_V,o = λ_V,c and λ_N,o = λ_N,c, and (c) η_V—η_N plane at m = 0 and δ_V = 0.02. The equilibrium points (pure vaccinator, disease-free) and (no vaccinator, disease-endemic) are stable in the red region which includes the point (1,1)—corresponding to the rational decision model, given the values of the rest of the cognitive parameters equal to one–whereas in the blue region the only stable point is . The rest of the parameters are κ = 1.69, c = 1.46, e = .95.