FIGURE 6.

ΔV_m maps after 10-ms cathodal (A) and anodal (B) shocks of strength 20 mA in the LRd, LRd+EP, and aLRd sheets. Each ΔV_m map is normalized to APA. Only part of the sheet, the one outlined by the black dotted rectangle in Fig. 1 B, is shown. The black square represents the unipolar shock electrode. The white circle denotes the site of peak ΔV_m magnitude in the virtual electrode. (C) Asymmetry ratios in the three cases at the centers of the black squares (physical electrodes) and the white circles (virtual electrodes) in panels A and B.