Figure 3.

Mode switches between tonic firing and oscillatory action. (A) Model neuron initially in a bursting mode. A short depolarization flips the model into the tonic firing mode, where it remains until a second perturbing pulse, which switches it back into the bursting model (Z.L., unpublished data). (B) Intracellular recording from R15 in Aplysia. The neuron was initially in the bursting mode but was switched into the tonic firing mode by a short depolarizing current pulse (modified from ref. 18).