The potential landscapes for different stimulus inputs and motion coherence. (a)–(c) Potential landscapes in the state space of average gating variables S₁ and S₂ at the zero coherence level for different stimulus inputs, where the stimuli strength μ₀ = 0, 10 and 30 Hz, respectively. The central attractor corresponding to the undecided state is indicated by c in the figure, and a and b on two sides indicate the two decided states. (d)–(f) Two-dimensional potential landscapes at the non-zero coherence level, where μ₀ = 30 Hz and the coherence c′ = 0.2, 0.3 and 0.65, respectively. In all these subgraphs, the parameters a = 269.5 and b = 108 and the diffusion coefficient D = 3.6 × 10⁻⁷.