Fig. 8

A: Increasing \(g_{M}\) moves the I-fold in the positive v direction, equivalent to raising the I-cell threshold. The singular trajectories are approximated by setting \(\epsilon=0.001\) in (10). Folds are approximated by equations (18), and fixing \(w=0.74\) for the green (low \(g_{M}\)) I-fold, and \(w=0.7\) for the red (high \(g_{M}\)) I-fold. Other parameters used to generate this figure can be found in Appendix 4. B: The voltage traces of the I-cell (blue) and E-cell (red) are shown in the top panel. Parameter J is increased to 20 to show sparse entrainment. Other parameters are the same as the high \(g_{M}\) case in A. The M-current gating variable w is shown in the bottom panel. It builds up during spiking cycles and decays during missed cycles