Figure 1

Method 1 vs. Method 2: Gray-scale maps of subject b05. Upper diagram: (a) gray-scale plot of the relative frequency f₁(i,m) of intermittent m:2 phase coordination within a 1001-heartbeat window centered around the i th heartbeat and plotted against the time of day of the i th heartbeat; (b) weighted phase coordination ratio PCR₁ according to equation (6) (black line); (c) phase recurrency PR as the mean of the two maximal f₁ values in vertical direction (gray line) Lower diagram: (a) gray-scale plot of the corresponding normalized frequency f₂(i,m) of m:2 RSA pattern recurrence within a 1001-heartbeat window centered around the i th heartbeat and plotted against the time of day of the i th heartbeat; (b) weighted phase coordination ratio PCR₂ according to equation (6) (black line); (c) pattern predominance PP as the mean of the two maximal f₂ values in vertical direction (gray line)