Figure 3.

Steady state functions for the K⁺ current activation variable n (the n_∞ (V) curve, blue) and the Ca²⁺ current activation variable m (the m_∞ curve, red). When υ_n is increased from −16 mV (point a) to −14.5 mV (point b) or −12 mV (point c), the n_∞ curve shifts to the right. This makes the delayed rectifier channels activate at higher voltages. When υ_m is decreased from −20 mV (point d) to −22.5 mV (point e) or −26 mV (point f), the m_∞ curve shifts to the left. This makes the Ca²⁺ channels activate at lower voltages. When the m_∞ and n_∞ curves are sufficiently far apart, pseudo-plateau bursting is produced.