Figure 12.

Extracellular-to-ground impedance for a neuron recorded in acute brain slice. The same color code as in Fig. 7 was used. Dotted lines correspond to the mathematical model given by Eq. 3b (for details, see Fig. 11 and Online Appendix A). The modulus of the impedance is represented as a function of frequency. Parameters: R_m = 5 MΩ, τ_m = 10ms, r_d = 2 μm, l_d = 600 μm, ${\sigma }_e^i=5S/m$, and Z_g = .2 MΩ. NMR: $\frac{z_m^{\left(e\right)}}{r_m}=.5$; NMD: ν_wT = 0.01 Hz, $\frac{z_e^{\left(m\right)}}{r_m}=0.5+\frac{0.25}{1+\sqrt{i\frac{\omega }{{\omega }_{wT}}}}$, $\pi r_d^2\cdot z_i=\frac{1}{{\sigma }_e^i}+\frac{1}{1+\sqrt{i\frac{\omega }{{\omega }_{wT}}}}$. To see this figure in color, go online.