APA Dictionary of Psychology

a form of brain stimulation using scalp electrodes to deliver a low-intensity current to the brain that may excite or reduce neuronal activity. It is currently under investigation for clinical use, with research so far focusing on the possible effectiveness of tDCS in enhancing cognitive function and in treating depression, anxiety, and chronic pain. Its advantages over other forms of brain stimulation (e.g., transcranial magnetic stimulation) are its relatively low cost and its ease of administration.