Spike timing distance versus noise strength in uncoupled HR neurons. a
I
ext = 1.5. b
I
ext = 4. Initial conditions: {x
1, y
1, z
1} = {0.1, 0, 0} and {x
2, y
2, z
2} = {0.1 + dx, 0, 0}. Euler method is used and S
td is obtained by averaging over 20 samples. The considered noise strength is [1e-8, 1e1]