The nth spike time statistics of four typical IC cells, I–IV (shown in each column from left to right, respectively). Top, We present the mean nth spike time as a function of stimulus IPD (n = 1 in red squares; n = 2 in green circles; n = 3 in blue triangles; n = 4 in black triangles). Middle, We present the standard deviation of the nth spike time as a function of stimulus IPD (n = 1 in red squares; n = 2 in green circles; n = 3 in blue triangles; n = 4 in black triangles). Bottom, Probability of firing the nth spike (during 100 ms after stimulus onset) as a function of stimulus IPD (n = 1 in red squares; n = 2 in green circles; n = 3 in blue triangles; n = 4 in black triangles).