MRI Study of Noninvasive Transcranial Electrical Stimulation in Tinnitus

"In tES, a mild electrical current is passed between two or more electrodes placed on the volunteer's head (scalp). In this study, a mild unvarying (constant) electrical 2mA current is passed between two rubber electrodes placed on the head over auditory cortex for 20 minutes per session for 5 consecutive days. Because the electrical current direction (positive/negative) and current amplitude (2mA) does not vary or change during stimulation, this type of tES is also called transcranial direct current stimulation, or tDCS."