Evaluation of a Compact Hybrid Brain-Computer Interface System

Figure 7

Comparisons of classification performances between NIRS and HYB (blue circles) at t = 6 (a), 11 (b), and 14 s (c). At t = 6, comparison of classification performances between EEG and HYB (red circles) and between NIRS and HYB (blue circles) is provided. The three time points are selected when EEG, hybrid, and NIRS show the highest classification accuracies according to the results shown in Figure 6. Circles above the red diagonal indicate that the performance is improved by HYB compared with NIRS/EEG. Percentage values indicate the percent of subjects showing performance improvement by HYB compared with NIRS (black) or EEG (red). values indicate significance of the performance improvement by HYB compared with NIRS (black) or EEG (red).

(a)

(b)

(c)