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. 2009 Mar 24;10(2):251–267. doi: 10.1007/s10162-008-0148-5

FIG. 10.

FIG. 10

The Lyapunov exponent determines the dependence of the firing irregularity on stimulation rate. The Fano factor (A) and Lyapunov exponent λ(T) (B) versus the interpulse time T for the FN model without noise (black) and with noise (gray; RS = 0.07). The interpulse time is expressed in units of the spike downstroke time td. Note that no point is plotted if the Fano factor is less than about 0.001 or is undefined because the firing rate is zero. The stimulus level is 1.13278 times threshold as in Figures 2 and 7.