Simulation Experiments for Neural Pulses - Brain Theory from a Circuits and Systems Perspective - page 197

Experiment 5
Colliding Pulses
Purpose: The purpose is to demonstrate that colliding pulses annihilate each other.
The following code may be helpful.
itrig 0 1 dc ¼ 0 pwl(0,0,5us,10n,.2ms,5n,.21 ms,0)
itrig1 0 10 dc ¼ 0 pwl(0,0,5us,10n,.2ms,5n,.21 ms,0)
x1 1 2 seg1
x2 2 3 seg1
x3 3 4 seg1
x4 4 5 seg1
x5 5 6 seg1
x6 6 7 seg1
x7 7 8 seg1
x8 8 9 seg1
x9 9 10 seg1
x10 10 11 seg1
Simulation of a back propagation appears in Fig. A.17 . Simulation of an annihila-
tion appears in Fig. A.18 .
• Why do the pulses annihilate? (Hint: The negative potassium currents prevent
further triggering by adjacent positive sodium currents)