In a recent study published in the journal "Brain Stimulation," researchers found that transcranial direct current stimulation (TDCS) applied to the prefrontal cortex of the brain can help reduce symptoms of depression in people with mild to moderate depression. In the study, participants received TDCS for two weeks, five days a week, for 20 minutes each session. Results showed that participants who received TDCS had greater reductions in depression symptoms than participants who received a placebo.
However, other studies have shown that the effectiveness of TDCS for treating depression is limited. In a recent study published in the journal "The Lancet Psychiatry," researchers found that TDCS applied to the prefrontal cortex did not produce any difference in depression symptoms between participants who received TDCS and participants who received a placebo.