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Speaking condition in the electroencephalography (EEG) experiment. Participants were instructed to vocalize /a/ very lightly soon after that a gray circle drawn on a black background changed to a gray square. Three midline electrodes Fz, Cz, and Pz were used for calculating auditory evoked potential in response to auditory feedback of speech. The speech signal was sent into an auxiliary EEG channel for offline-extraction of the onsets of individual speech.
