Figure 4.

Comparison of the membrane potential computed by solving the Cable equation (red) and the EMI model (blue) for some different values of h, σ_i, σ_e, and g_L, where we recall that h = l_y = l_z (the width of the neuron). The plots show how the membrane potential in the compartment 25 μm from the start of the cell changes with time from t = 0.1 to 0.5 ms. The parameters used in the computations are given in Table 2 except for the values given above each plot. We observe that the difference between the two solutions increases when the value of h or σ_i is increased, and the difference decreases when the value of σ_e or g_L is increased. Note that in order to observe any effect of changing the value of g_L, we increase the default value by a factor of order 100–1,000 in the lower panel of the figure.