FIGURE 6.

Choice-decoding accuracies obtained in (simulated) real-time (individual and group results) using HbX channel selection and SDC correction. All participants but P04 reached accuracies higher than chance-level (orange, dashed line). The face colors and line pattern of the bar plots of each subject (left-half of the figure) represent the selected Hb-type and strategy participants chose to perform, respectively. Mean decoding accuracies and standard deviation of all participants and with different grouping factors can be found on the right-half of the figure. Groupings were based on the analysis type (simulated real-time vs. real-time), the motor imagery participants chose [interacting with the cube (cube) vs. mental drawing (MD)], the selected chromophore (HbO vs. HbR) and previous BCI experience (novices, average and experts). Participants with no previous BCI/fNIRS/task experience were considered novices; expert participants were those who had participated in more than five BCI experiments; the remaining participants were considered average (see Table 2). The integer after “N = ” indicates the number of participants employed in each computation.