Fig. 6

Effect of \(c_{\mathrm{tot}}\) on the fast-slow subsystem. Effect of variations in \(c_{\mathrm{tot}}\) on the trajectories of the fast-slow subsystem \((v, y, ca_{i}, na_{i})\) for \(l=0.94\). In (A) \(c_{\mathrm{tot}}=0.6\) (bursting), (B) \(c_{\mathrm{tot}}=0.7\) (tonic spiking at low \(ca_{i}\) and \(na_{i}\): \(ca_{i}\approx2.5\times10^{-2}\), \(na_{i} \approx0.6\)) and (C) \(c_{\mathrm{tot}}=0.74\) (tonic spiking at high \(ca_{i}\) and \(na_{i}\): \(ca_{i}\approx 0.57\) and \(na_{i}\approx0.85\))