Fig. 4.

Waveform potential at a stimulating electrode vertex. Frequency decomposition of a stimulating square pulse allows to infer the effect of dispersive material (Gabriel et al. 1996). The dielectric properties of the electrode-electrolyte interface are calculated with a parallel pseudocapacitive component and resistance (Cantrell et al. 2007) or a capacitive component and resistance at the average frequency of the FFT. The original pulse and pulses at a vertex at the interface of the stimulating electrode are plotted and the combinations of electrode interface and tissue properties are indicated in the legend