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An example of 14 EEG signal channels, where the x-axis denotes time and the y-axis represents the magnitude of the 14 signals [39]. These signals can be characterized by their frequency, which refers to the number of cycles per second (Hz) of the electrical activity. These channels are named AF3, F7, F3, FC5, T7, P7, O1, O2, P8, T8, FC6, F4, F8, and AF4, which correspond to the specific electrode placements on the Emotiv Epoc equipment.
