(A) Sinusoidal head acceleration stimulus (top) with raster plots showing the responses of example irregular (middle) and regular (bottom) afferents. (B) Plots of cycle histograms showing firing rate as a function of phase for the same example irregular (top) and regular (bottom) afferents, showing the corresponding values of PLI1 (i.e., vector strength) and PLI2 (i.e., entropy-based). (C) Plots of cumulative probability as a function of first spike time normalized by the mean interspike interval (ISI) for the same example irregular (top) and regular (bottom) afferents with the corresponding values of PLI3. (D) Population-averaged values of PLI1, PLI2, and PLI3 for irregular (top) and regular (bottom) afferents (solid). The hollow bars show the values computed from our model irregular (red) and regular (blue) afferents. Overall, no significant differences were observed (irregular PLI1, p=0.73; irregular PLI2, p=0.55; irregular PLI3, p=1; regular PLI1, p=0.83; regular PLI2, p=0.50; regular PLI3, p=1). (E) Phase locking indices PLI1 (left), PLI2 (middle), and PLI3 (right) as a function of stimulus frequency. (F) Spike-timing precision as a function of PLI1 (left), PLI2 (middle), and PLI3 (right) for regular (blue) and irregular (red) afferents. Strong positive correlations were observed in both cases (left: R = 0.84, p=1.88E–06; middle: R = 0.87, p=4.35E–07; right: R = 0.7, p=0.001).