The critical manifold is projected onto the (c, V)-plane for (a) gK = 5.1 nS, gBK = 0.4 nS and (b) gK = 4 nS, gBK = 0.4 nS. L- and L+ are the lower and upper fold curves, respectively. P(L-) and P(L+) are the projections of L- and L+. The shaded regions are singular funnels which are delimited by the curves L+ and the strong canards (SC, green curves). The singular periodic orbits (black curves with arrows) are superimposed. FN is a folded node singularity. δ < 0 in panel (a) and δ > 0 in panel (b).
Teka et al. The Journal of Mathematical Neuroscience 2011 1:12 doi:10.1186/2190-8567-1-12