Fig. 9

Comparison of ensemble average simulations vs. analytic expansions for the Fitzhugh–Nagumo model. For each moment, we show the one-loop (for the mean) or tree (for the two-point cumulants) level approximation (solid line) along with simulations for \(D = 0.001\) (dashed line), \(D = 0.01\) (dot–dashed line), and \(D=0.015\) (dotted line). Means have been scaled by DV and two-point cumulants have been scaled by D so they can be compared directly