Fig. 1.

(A) Grand average VEPs elicited by the standard checkerboard stimulus in example midline parietal-occipital channels for Placebo (Top) and DCS (Bottom) participants across VEP assessment blocks. (B) Scalp topography of C1 and P2 for Placebo (Top) and DCS (Bottom) participants across VEP assessment blocks. C1 analyses were based on average peak amplitudes from four channels surrounding Oz and Iz (i.e., Oz, Iz, O1, OI1h); P2 analyses were based on average peak amplitudes from six channels surrounding POz, Oz, and Iz (i.e., POz, Oz, Iz, POO1, O1, OI1h).