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Scatter plot representing the correlation between pre-stimulus frontal alpha levels and the Tinnitus Handicap Inventory (THI) scores in the TIN group. For convenience it was also reported on the right the corresponding threshold for the different THI scores: mild (18–36), moderate (38–56), and severe (58–76 points) reported by the participants to the study; no one reported ‘catastrophic’ tinnitus handicap scores (78–100 points).
