Active and sham tDCS
CORTEX
tDCS is a Transcranial Electrical Stimulation (tES) technique that was delivered by Soterix Medical 1 × 1 Low-Intensity Transcranial Electrical Stimulator (tES) Model 2001. The stimulation site is the left dorsolateral prefrontal cortex (DLPFC) and contralateral upper orbital border area. According to previous research, we choose the left dorsolateral prefrontal cortex (DLPFC) as the anodal point and the contralateral upper orbital border area as the cathodal point. The current is two mA continuous, direct current; the plastic electrode piece is placed in a sponge (5 cm *7 cm) soaked in normal saline, the electrode should not be exposed during placement. Stimulation is done for 30 min. For sham stimulation, the treatment parameter setting and evaluation tools were the same as the active group, except the current will stop after 30 s from stimulation, so the same sensation as in active group (tingling of the skin) was induced.