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(a–f): Electroencephalograph (EEG) signal recordings for control group before (a), during (b) and after (c) the instrument operation with sound rhythm at 10 Bps; and for experimental group before (d), during (e) and after (f) BR10. Note: Elevations of EEG frequency within the range 15–27 Hz (∗) in channels 3–6 was recorded during instrument operation with BR10.
