Three tones at different frequencies (500 Hz, 1 kHz, and 2 kHz) were used to reduce the effect of habituation to the stimulus. Tone presentation was performed at 65 dB using speakers placed approximately 0.75 m from the participants at 45° on either side. A “+” symbol was displayed on the center of the screen, and the participants were instructed to fixate on it. The task involved pressing the space key immediately after the auditory stimuli presentation. The aforementioned tones were randomly presented 90 times using an inter-stimulus interval between 1.5 and 2.5 s to prevent anticipation. This task was performed twice with the approximate total experimental time being 6 min.

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