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

FIG. 7.

FIG. 7

Long-term growth in the response to a small perturbation produces firing irregularity at late times. The response of the voltage-like variable x of the FN model over short (A) and long (C) time scales and the corresponding log of the magnitude of the perturbed response Inline graphic (B, D). The size of the perturbed response is expressed in terms of the initial perturbation size Inline graphic. The stimulus rate is 5 kHz and the stimulus level is 1.13278 times threshold, as in Figure 2.