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Baseline pain characteristics in participants with and without response to neurofeedback. Each line represents a patient case (indicated on the right end of the line). Neurofeedback responders are show in blue, neurofeedback non-responders — in red color. MHDs — headache frequency, monthly headache days; MPQ — McGill Pain Questionnaire: Sensory (Sens), Affective (Aff), Evaluative (Eval) scores and the Pain Rating Index (PRI); NF — neurofeedback.
