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. 2013 Jul 19;8(7):e69984. doi: 10.1371/journal.pone.0069984

Figure 9. Changes in the voltage nullcline caused by the increasing applied current and maximal NMDAR conductance.

Figure 9

(A) During applied depolarization, an equilibrium state interrupts the oscillatory cycle. During NMDAR activation, the voltage nullcline becomes more flat, and this causes a frequency increase. (B) If the NMDAR has a steeper voltage dependence, the voltage nullcline remains strongly folded, and the frequency remains low.