Figure 5.

Visualization of individual hemodynamic responses (depending on the channel, type of stimulus, oxy- or deoxyhemoglobin ([O₂Hb] or [HHb])) in patients with CLBP (n = 12) that were statistically significantly different to the group average of hemodynamic responses obtained from the healthy population. The direction of deviation is color-coded (red: stronger, blue: weaker). PAPain, painful pressure; PAnp, non-painful pressure; Brush, brushing; SMA, supplementary motor area; S1, primary somatosensory cortex.