Figure 1
From: Critical slowing in a Hodgkin-Huxley neuron near spiking threshold
Subthreshold response to white-noise perturbation as a function of Idc stimulus current. Solid black curves show theoretical ±3 standard deviation limits for voltage excursions δV away from equilibrium and each vertical gray trace shows actual maximal excursions recorded in 200 ms stochastic simulation runs of the four-variable Hodgkin-Huxley equations at each of 2000 settings for stimulus current ranging from -0.05 to +0.05 nA.