Biological and Psychological Markers After Intervention in Adults With GAD

"Participants will receive by trained personnel, transcranial direct current stimulation (tDCS) targeting the dorsolateral prefrontal cortex (DLPFC). According to the international 10-20 EEG system, the anodal electrode will be placed over the left F3 position and the cathodal electrode over the right F4 position. Active stimulation will be delivered using a constant current of 2 milliamperes (mA) for 20 minutes per session. The intervention will consist of twelve consecutive daily sessions (Monday to Friday), totaling four week of treatment. A certified tDCS device will be used, programmed to deliver a ramp-up and ramp-down period of 30 seconds.~In the sham condition, the same electrode montage will be used; however, the device will automatically ramp down the current after 30 seconds, mimicking the initial tingling sensation without producing lasting neuromodulatory effects. This sham protocol is commonly used to ensure participant blinding in tDCS studies."