Figure 3
Mean Δ[O 2 Hb] and Δ[HHb] profile. Mean Δ[O2Hb] and Δ[HHb] (mean ± SE μmol/l) on the overall-subject-level averaged over 12 trials for each channel separately (channel 1 [black], channel 2 [dark gray], channel 3 [light gray]), of the contralateral (right) hemispheres during performance of MI-simple and MI-complex. Shown are also relevant significances of paired t-test (CI 95%, p-values) of Δ[O2Hb] between the two tasks. The second y-axis (green) represents the Δ[O2Hb] signal-to-noise ratio (SNR, defined as the ratio of the mean signal to its standard deviation) for each channel; the values of each SNR are shown below.