Electroencephalography (EEG)
bipolar
EEG was performed using the Neurofeedback System (Panaxtox Corp, Seoul, Korea) developed by the Korea Psychiatry Research Center. This device simultaneously measures the left and right EEG traces in FP1 and FP2 of the prefrontal lobe using two electrodes in a sequential bipolar montage, following the International 10–20 system. A solid electrode was attached to the headband; subsequently, EEG was measured from the left and right frontal lobes through the FP1, FPz, and FP2 channels, which were fixed at 4-cm intervals on the left ear lobe as a round electrode. EEG measurements assess real-time brain function and allow objective brain function analysis. EEG is a frequency-based spectrum analysis method that captures the degree of slow and fast waves through correlation and provides more information than existing analysis methods for each [