A Balance Equation Determines a Switch in Neuronal Excitability
Figure 3
A continuous deformation from the restorative phase portrait of Fig. 1 left to the regenerative phase portrait of Fig. 1 right involving a transcritical bifurcation [17, Section 3.2] determined by the algebraic conditions (2) and (3).
The dark blue circle represents a restorative stable steady-state, the light blue circle a regenerative stable steady-state, and the half-filled circle represents the transcritical bifurcation which separates the restorative and regenerative regimes.