Some Computational Aspects of the Brain Computer Interfaces Based on Inner Music

Figure 2

A power spectrum of EEG signal recording with simultaneously played tones c2 and g2, top left; its part containing c2 and g2 lines, left center; the spectrogram of the extracted portion of the spectrum, with prominent c2 and g2 lines, low left; the major part of the spectrogram exhibiting some artifacts and other high-frequency features, right side. Low frequency—bottom; intensity—brightness coded; time—recent at the right edge.