Fig. 3.

Simulation of various physical quantities involved in oscillations when spiking in the parabolic bursting model is suppressed. Oscillations are obtained using the parameter set g_p with g_NaF = g_NaP = 0. The instances of maximum voltage are marked by vertical dashed lines to illustrate the phase shift of physical quantities relative to V. (a) Slow wave in membrane potential underlying parabolic bursting. (b) Intracellular Ca²⁺ concentration showing π/2 phase shift relative to V. (c) Competing slow-wave currents I_s (inward) and I_KCa (outward). (d) Remaining currents I_h (inward, solid line), I_HVA (inward, dashed line), I_A (outward, solid line), and I_K (outward, dotted line) contribute to shaping the oscillations in V. The current I_LVA is not shown since it is close to zero during oscillations