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Depression is accompanied by cognitive control defects. Transcranial direct current stimulation (tDCS) has been found to be a promising non-invasive treatment for depression. Studies have explored whether tDCS can improve cognitive function in patients with depression, but the results were not consistent.
The study summarized the relevant evidence from sham-controlled randomized controlled trials (RCTs) whether prefrontal tDCS improves cognitive function in patients with depression.
Seventeen sham-controlled studies were selected from 252 papers. Systematic analysis shows that the prefrontal tDCS has a promising prospect in the working memory and emotion process of depression patients; however, there is insufficient evidence to support the reliable influence of tDCS on psychomotor speed, learning, speech process, and overall cognitive function.
Our review shows that the prefrontal tDCS has positive effects on working memory and emotion processes, but has limited impact on other cognitive functions.
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