Figure 7.

Magnitude values of group average of wavelet coherence between haemoglobin concentration changes ΔHbO (left) and ΔHbR (right) and the four physiological signals. In the columns from top to bottom results for mean arterial blood pressure, heart rate, skin blood flow, and respiration are shown, respectively. Haemoglobin concentration changes extracted from m₀, m₁, and V are plotted in blue, green, and red, respectively. The gray area under the black curve indicates the noise level for the magnitude of the group mean value of the WCOH between ΔHbO or ΔHbR and the physiological signals. Light blue, light, red and light green bars indicate the following three time scale ranges: R-band (scales around 3 s and pseudofrequencies around 0.3 Hz), M-band (scales around 10 s and pseudo-frequencies around 0.1 Hz) and A-band (scales around 35 s and pseudo-frequencies around 0.033 Hz), respectively. The colored shadowed areas represent standard error of mean for each curve.