Fig. 9.

A: relation between external stimulus strength C and neural input I as described by a simple dynamical system given by Eq. 6 (black curve). For a given stimulus strength, the neural input simply takes on the value of one stable attractors (solid lines). In the bistable regime, the value of neural input depends on its initial condition (above or below the unstable fixed point, dashed line). Gray curve shows a hypothetical preprocessing I = g(C) that would not destroy the ID regime, but would make it very small. B: The dynamical behavior for the model given in Fig. 6B {f(x) = ${\sqrt{\left[x\right]}}_{*}$ with c = 0.05 and adaptation only} when the parameter I is replaced with the variable I from Eq. 6. m₁ = −0.2 and m₂ = 2.8 as to encapsulate the ID regime of Fig. 6B (see vertical lines of Fig. 6B).