Figure 1

Simulation of contractions and creation of corresponding spatio-temporal (= ST) maps. In panel 1, a segment is depicted with a contraction propagating from left right. The intestinal diameter, as shown in panel 2, is 100% along the segment and decreases to 10% at the location of the contraction. Panel 3 shows an intensity line at this particular instance in time (white for total occlusion and dark for a 100% open lumen). At each time step, as the contraction propagates to the right, a new diameter curve is plotted, converted into an intensity line which is then stacked on top of the previous lines in the ST map (panel 4).