Fig. 6

The average relative changes of PSD during neurofeedback over all NF training sessions (mean ± STD) for each single participant. The horizontal dot lines mark Δ10% change in relative power with respect to the baseline recording. Positive values show increase and negative values show decrease with respect to the baseline power. Note that the NFB task was to increase the power of alpha for 10% or more and to decrease the power of theta and beta band for 10% or more. a Theta (4–8 Hz) in blue, and “individual” theta in orange. b alpha (9–12 Hz) in blue and individual alpha in orange colour. c higher beta (20–30 Hz) in blue and “individual” higher beta in orange. The results of participants 6, 8, 9, 13, and 15 are missing because they did not use the BCI NFB at home. Asterisks show statistically significant differences with respect to the baseline (p = 0.05)