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Hemodynamic changes using functional near-infrared spectroscopy pre- (session 0) and post- (session 16) NF training. The mean oxygenated hemoglobin concentration changes in the prefrontal cortex in case 3 (A) and case 4 (B) during the 1st EH before emotional distraction, ED, and 2nd EH after emotional distraction phase of the working-memory-task period. 1st EH = 1st EH delay/hold period; 2nd EH = 2nd EH delay/hold period; ED = during emotional distraction; NF = neurofeedback.
