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Table 1 Mean Δ[O2Hb] and Δ[HHb] profiles.

From: Single-trial classification of motor imagery differing in task complexity: a functional near-infrared spectroscopy study

Mean Δ[O2Hb] Δ[HHb] Overall-subjects Channel 1 Channel 2 Channel 3 Overall channels
MI-simple     
Δ[O2Hb] μmol/l 0.101 ± 0.013 0.054 ± 0.014 0.038 ± 0.011 0.064 ± 0.012
Δ[HHb] μmol/l -0.017 ± 0.002 -0.0130 ± 0.003 -0.011 ± 0.003 -0.014 ± 0.003
Δ[O2Hb] SNR 0.99 0.54 1.08 0.87
MI-complex     
Δ[O2Hb] μmol/l 0.192 ± 0.012 0.095 ± 0.012 0.065 ± 0.010 0.118 ± 0.011
Δ[HHb] μmol/l -0.008 ± 0.006 -0.010 ± 0.003 -0.007 ± 0.003 -0.009 ± 0.003
Δ[O2Hb] SNR 1.04 1.23 1.55 1.27
Inter-task paired t-test [simple vs complex] Channel 1 Channel 2 Channel 3 Overall channels
  Δ[O2Hb]
(p-values)
Δ[O2Hb]
(p-values)
Δ[O2Hb]
(p-values)
Δ[O2Hb]
(p-values)
Overall-subjects ≤ 0.001* 0.018* 0.064 ≤ 0.001*
Subject 1 ≤ 0.001* ≤ 0.001* ≤ 0.001* ≤ 0.001*
Subject 2 0.341 ≤ 0.001* ≤ 0.001* ≤ 0.001*
Subject 3 1.000 0.003* ≤ 0.001* 0.032*
Subject 4 1.000 ≤ 0.001* ≤ 0.001* ≤ 0.001*
Subject 5 ≤ 0.001* ≤ 0.001* ≤ 0.001* ≤ 0.001*
Subject 6 0.105 0.007* 0.002* 0.046*
Subject 7 ≤ 0.001* 0.023* ≤ 0.001* ≤ 0.001*
Subject 8 0.086 ≤ 0.001* 0.004* 0.002*
Subject 9 ≤ 0.001* ≤ 0.001* ≤ 0.001* ≤ 0.001*
Subject 10 0.976 ≤ 0.001* ≤ 0.001* ≤ 0.001*
Subject 11 0.181 ≤ 0.001* ≤ 0.001* ≤ 0.001*
Subject 12 0.324 0.026* ≤ 0.001* 0.039*
  1. (Top) Mean Δ[O2Hb] and Δ[HHb] (mean ± SE μmol/l) and Δ[O2Hb] signal-to-noise ratio (SNR, defined as the ratio of the mean signal to its standard deviation) on the overall-subject-level averaged over channels 1-3 and for each channel separately, of the contralateral (right) hemispheres during performance of MI-simple and MI-complex (Bottom) Inter-task paired t-test (CI 95%, p-values) for each subject of Δ[O2Hb] between the two tasks, MI-simple and ME-complex.
  2. Significant values are highlighted with (*).