Figure 3  .

Effects of: (A) dominant (closed circle) and non-dominant pudendal nerve (open circle) stimulation (n=6); and (B) symmetric right (closed square) and left (open square) pudendal nerve stimulation (n=2) on the amplitudes and latencies of the cortically evoked anal responses at increasing ISIs. The vertical axes show the percentage of the response to cortical stimulation alone; the horizontal broken line indicates 100%. Dominant pudendal nerve stimulation produces relatively greater facilitation of the cortically evoked responses than non-dominant pudendal nerve stimulation (p<0.001); in contrast, prior symmetrical pudendal nerve stimulation has equal effects from either side.