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. Author manuscript; available in PMC: 2013 May 14.
Published in final edited form as: Clin Neurophysiol. 2005 Oct;116(10):10.1016/j.clinph.2005.06.023. doi: 10.1016/j.clinph.2005.06.023

Fig. 1.

Fig. 1

Fourier FEM method. (A) The stimulus waveform was created in the time domain and (B) subsequently converted to the frequency domain (magnitude and phase shown) using a discrete Fourier transform. The voltage waveform within the volume during (C) current-controlled stimulation and (D) voltage-controlled stimulation was calculated from the Fourier FEM solver. The differences between the original and Fourier FEM waveforms were dependent on pulse width and capacitance values.