Brain stimulation lowered depression scores immediately; lasting benefit remains uncertain
A meta-analysis of small trials found lower depression scores after active stimulation, but no statistically clear advantage at later follow-up.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Active tDCS lowered depressive symptom scores immediately after treatment compared with sham in people with treatment-resistant depression. The smaller follow-up evidence set found no statistically significant difference. That leaves lasting benefit uncertain and does not establish equivalence. Results varied substantially across trials, so the pooled immediate improvement should be interpreted cautiously.
The review drew on a few small trials with inconsistent findings. The abstract provides no detailed safety results and does not identify the type or confidence level of the reported intervals.
What researchers found
Depressive symptom scores immediately after treatment
Active tDCS versus sham; pooled standardized mean difference.
Depressive symptom scores 30 days after treatment
Active tDCS versus sham; pooled standardized mean difference.
Reading the symptom scale
A standardized unit represents a standard deviation, a measure of how much participants’ scores vary. Negative values mean lower scores with active stimulation than sham; zero means equal average scores. These are not recovery rates.
Persistence needs more evidence
Fewer studies contributed to follow-up, and their results did not clearly favor either treatment. Longer observation and more consistent study methods are needed to establish whether the immediate symptom improvements persist.
The original publication
Efficacy and safety of transcranial direct current stimulation (tDCS) on treatment-resistant depression (TRD): A systematic review and Meta-analysis of randomized clinical trials.
Moshfeghinia R, Naderian R, Najibi A et al.
J Affect Disord · 2026
- PubMed ID
- 41936982
- Record checked
AI-assisted research and writing. This explains one selected publication; it is not a complete review of everything known. Our approach.
One more question, understood.
Keep track of the research you’ve explored.