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. 2016 May 25;10:49. doi: 10.3389/fncom.2016.00049

Figure 2.

Figure 2

Three ways the postsynaptic potential x0(t) (solid) can reach the threshold (dashed) when two pulses are applied. The above-threshold time ΔT may consist of one interval by crossing upon the second pulse only (A) or upon the first pulse staying above threshold until the second pulses (C). If the pulses are well separated in time ΔT consists of two intervals (B). Temporal properties are NoP = 2, IPI = 20 ms and PW = 0.525 ms, and the amplitude are varied, i.e., not equal to A50.