Figure 4: Exemplar MGB unit showing differential responses to SAM presentation order, modulation depth and CT blockade:

A. a representative MGB unit showing a higher discharge rate (spikes/sec) to randomly presented ${\text{SAM}}_{\mathrm{\Delta }100\text{\%}}$ across $f_{\text{mods}}$ than to predictable/repeating ${\text{SAM}}_{\mathrm{\Delta }100\text{\%}}$ stimuli in dot raster and rate-modulation transfer functions (rMTFs). B. When modulation depth was decreased to ${\text{SAM}}_{\mathrm{\Delta }25\text{\%}}$, less distinct stimuli, the same MGB unit showed increased/greater responses to a predictable/repeating SAM, especially at higher $f\text{ms}$. C. Optical blockade of CT input resulted in a return to strong random preference even in response to less distinct stimuli, ${\text{SAM}}_{\mathrm{\Delta }25\text{\%}}$ in this same exemplar.