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. 2016 Jan 5;110(1):234–246. doi: 10.1016/j.bpj.2015.11.019

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© 2016 by the Biophysical Society.

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Global intracellular impedance measurements of a striatal neuron recorded in vitro (current-clamp) and stimulated with sinusoid inputs from 6 to 926 Hz. (A) Sine waves of current (top, red; minimum 25 samples and 20 cycles per sample) were injected in patched neurons while recording the intracellular potential (top, in blue; 16.7 kHz sampling). (B) Modulus of Z_eq (log scale) represented as a function of frequency (log₁₀(f)), for sine wave current injection (600 pA amplitude). (C) Fourier phase of Z_eq in the same experiment. Parameters of the models: (resistive) R_m = 120 MΩ, C_s = 46 pF, and R_e = 28 MΩ; (diffusive) R_m = 130 MΩ, C_m = 59 pF, A = 58 MΩ, B = 43 MΩ, and f_W = 30 Hz. (A, B, and f_W are parameters of the diffusive impedance scaling; respectively, its amplitude, phase, and cutoff frequency.) Representative of N = 18 cells. To see this figure in color, go online.