(a), (b) Potential landscapes for different diffusion coefficients, where μ₀ = 0 Hz, c′ = 0, and the diffusion coefficient D = 1.6 × 10⁻⁷, 1.0 × 10⁻⁶, respectively. a and c represent the decided state and undecided state, respectively. s represents the saddle point between a and c. (c) The barrier heights versus D. Here U_sa = U_s − U_a and U_sc = U_s − U_c. (d) The barrier heights versus the corresponding mean first passage time. τ_as and τ_cs indicate the mean first passage time from state a and state c to saddle point s, respectively. (e) The barrier heights versus input strength μ₀. (f) The mean first passage time versus input strength μ₀. τ_ca indicates the mean first passage time from state c to state a. τ_ac indicates the mean first passage time from state a to state c. In all these subgraphs, parameters a = 269.5 and b = 108 and motion coherence c′ = 0.