Figure 9.

Average normalized firing rate relative to pre-CS baseline of eyelid PCs and average position, velocity, and acceleration of eyelid CRs where all mentioned quantities were aligned by onset of the CR at a given trial and then averaged. Therefore, here time equal zero means the onset of CR. CR kinematic measures for the different ISIs are truncated to prevent contamination from the response to the US due to the inconsistent relationship between onset and amplitude. Aligned by CR onset the average responses of eyelid PCs are quite similar over the 200 ms before CR onset. At CR onset, eyelid PC activity was between 80 and 85% of baseline for all four ISIs.