Figure 5

Sample subjects Δ[O ₂ Hb] and Δ[HHb] profile. Averaged Δ[O₂Hb] (red) and Δ[HHb] (blue) responses in two sample subjects (subject 1 and 2) corresponding to the classification defined in Table 2. After the rest period (20 s) the on- and offset of the stimulation period (15 s) are indicated by dashed lines from time = 0 - 15 s. The regions highlighted with a box correspond to the time intervals selected for the classification as specified in Table 2.