Processing of the frequency-based data of the NF training
The data sets of the NF training sessions were each filtered using 0.3 to 40 Hz bandpass and artifacts were removed and prepared for further processing and Fourier power analysis. The corresponding values of the frequencies were given in 0.5 Hz steps and each from 1 to 40 Hz; the spectral average over 10 seconds was obtained in each case. For subjects 42 and 52 there were no entries in time intervals. Therefore, the corresponding data were not evaluated. (Detailed evaluations were not available for the following subjects and data sets (sessions): 004_01, 004_02, 004_03, 004_07, 007_03, 008_01, 008_02, 008_05, 011_05, 013_06, 016_02, 016_06, 016_09, 021_06, 024_06, 025_03, 025_06, 025_07, 025_08, 029_04, 029_06, 030_06, 037_01, 037_09, 038_02, 038_034, 038_06, 040_01, 040_02, 047_05, 047_06, 047_07, 052_01).