Frequency power spectrum analysis of the colonic motility in response to celiac branch vagus nerve stimulation (2 Hz, 5 mA) at pulse width of 4 ms alone or with anodal block at baseline (30 min), during the stimulation (15 min) and post stimulation (30 min) in proximal, transverse and distal (n=7–14) regions. Data are mean ± SEM, Wilcoxon paired or Mann-Whitney unpaired t tests, **p<0.01 vs baseline in respective groups.