NEURON Tutorial #21

Goals: Examine The Properties of Fourier Transform of Chirp Current and Voltage Response

Contents:

1. Current and voltage traces.
2. Fourier transform of current trace.
3. Fourier transform of voltage trace.
4. Impedance magnitude, impedance phase, and voltage lag.

Conditions:

e_pas = -65 (mV)
gbar_h = 0 (S/cm2)

Summary:

1. Current and voltage traces

Baseline in voltage is removed.

2. Fourier Transform of Current Trace

3. Fourier Transform of Voltage Trace

4. Impedance Magnitude, Impedance Phase, and Voltage Lag

Notes

It is surprising that the magnitude profiles of current's and voltage's Fourier transform are zigzag, but the profile of impedance magnitude is smooth!
Another surprising finding is that the impedance phase is small at lower frequency, but the voltage lag is large there.