Figure 2: Effects of stimulus modulation depth on temporal locking properties of MGB units:

To assess the ability of units to temporally follow the SAM stimulus, the Rayleigh score for each $f_{\text{mods}}$ (2–128) was used to generate a heat map based on the temporal responses of all 80 MGB units studied. MGB units might lock to a single or multi $f\text{ms}$ based on the Rayleigh score. Warmth of color indicates the percentage of neurons (out of 80) showing temporal-locking (Rayleigh statistic ≥ 13.8) to the SAM stimuli. Hot colors (red) indicate a higher percentage of units showing temporal-locking (e.g ${\text{SAM}}_{\mathrm{\Delta }100\text{\%}}$ at 64 Hz $f\text{m}$), whereas cool colors (blue) indicate a lower percentage of units showing temporal locking (e.g. ${\text{SAM}}_{\mathrm{\Delta }25\text{\%}}$ at 16 Hz $f\text{m}$). Significant differences were observed between ${\text{SAM}}_{\mathrm{\Delta }100\text{\%}}$ and ${\text{SAM}}_{\mathrm{\Delta }25\text{\%}}$ regardless of order of presentation, with and without CT blockade (Wilcoxon test followed by Bonferroni correction, p < 0.05).