An international clinical trial found that adults with major depression can successfully complete a six-week course of home-based brain stimulation combined with a video game after up to five instructional clinic visits. The study, conducted through clinical centers in Jerusalem, Riga, and Munich, achieved its primary objective by demonstrating the feasibility of remote treatment. However, the experimental combination of active transcranial direct current stimulation (tDCS) and computerized cognitive training did not lead to greater improvement than a “double-sham” control condition combining sham brain stimulation with a control game . Both groups showed a marked reduction in depressive symptoms, raising important questions about which elements of the treatment experience may contribute to improvement.
A new international clinical trial has found that people living with major depression can reliably use a non-invasive brain stimulation system at home. Published in JAMA Network Open the study shows that a relatively complex remote treatment protocol can be delivered safely and feasibly across several countries, while also underscoring the need to better understand what drives symptom improvement in depression trials.
Depression affects millions of people worldwide, and while medication and psychotherapy can be effective, not everyone responds to existing treatments. Researchers are therefore exploring alternatives that could make mental health care more accessible, including technologies that patients can use from the comfort of their own homes.
The international clinical trial, known as DiSCoVeR, examined whether combining non-invasive electrical brain stimulation with a specially designed video game could help reduce symptoms of major depression when administered mostly at home.
The Discover trial is a European consortium, funded by the national partner organizations under the umbrella of the European Research Area Network (ERA-NET) NEURON. The project was led by Prof. Mor Nahum from the Hebrew University, with clinical sites at Hadassah Medical Center in Jerusalem (Prof. Omer Bonne and Dr. Amit Lotan), LMU Munich (Prof. Frank Padberg; first author Esther Dechantsreiter) and Riga Stradins University (Prof. Elmars Rancans). The intervention technology was developed with the University of Geneva (Prof. Daphne Bavelier) and EPFL (Prof. Friedhelm Hummel), and statistical analyses were led by Prof. Yuval Benjamini (Hebrew University) and Prof. Stephan Goerigk (LMU Munich).
The technique, called transcranial direct current stimulation (tDCS), delivers a weak electrical current through electrodes placed on the scalp to influence brain activity. Researchers combined this stimulation with a video game designed to strengthen cognitive skills such as attention, memory, and executive control, which are often affected by depression.
The study involved 109 adults diagnosed with major depressive disorder at clinical centers in Jerusalem, Riga, and Munich. Participants first attended a few instructional visits at the clinic and were asked to complete 30 treatment sessions over six weeks, primarily at home.
One group received active brain stimulation while playing a video game targeting cognitive control, developed by the research team. The other received sham stimulation alongside a similar-looking control game that did not include the same cognitive training exercises.
The results demonstrated that remote treatment was achievable. In total, 79% of participants completed at least 20 sessions, with almost 2,500 sessions successfully completed across the three countries. The treatment was also generally well tolerated, with no significant differences in adverse event rates between the groups.
Both groups improved, but why?
Despite the successful implementation, the researchers found no evidence that the experimental combination of active stimulation and cognitive training was more effective than the control intervention.
Participants receiving active stimulation and cognitive training experienced an average improvement of 7.3 points on a standard depression rating scale. Surprisingly, participants in the control group showed a similar improvement of 8.2 points. The difference was not statistically significant.
"Both groups improved substantially, and that is the finding I keep returning to," said Prof. Nahum. "We still have a great deal to learn about what is actually driving improvement in depression: the neuromodulation, the cognitive training, expectations, engagement, ongoing care, or simply the structure of returning to a treatment every day. Our study cannot answer that, but it shows why carefully designed control conditions are essential if we want to find out."
Another finding concerned participants' expectations. Those who believed they had received the control treatment tended to show less improvement, regardless of which treatment they actually received.
The researchers stress that this finding should be interpreted cautiously. The study does not show that belief in the treatment cures depression, nor can it establish whether expectations directly influenced recovery. It is also impossible to determine whether improvements in the control group resulted from the treatment routine, ongoing medical care, natural changes in symptoms, participation in a clinical study, or other factors.
The findings highlight the importance of designing convincing control conditions when testing new treatments, particularly digital and device-based interventions that require patients to actively participate in their care.
A step toward accessible mental health care
Although the combined treatment did not demonstrate additional clinical benefits over the control condition, the researchers emphasize that the study achieved its primary objective: showing that patients with major depression can successfully administer a relatively complex brain stimulation program at home after minimal in-person instruction.
The results do not mean that brain stimulation is ineffective for depression. Rather, they suggest that this particular combination of stimulation and cognitive training requires further investigation before it can be recommended for routine clinical use.
Future studies may help determine whether different stimulation parameters, cognitive exercises, treatment timing, patient groups, or clinical support structures could produce different results.
As interest in remote and technology-based mental health care continues to grow, the findings offer an important lesson: making treatment accessible is only part of the challenge. Understanding which elements of a treatment actually improve patients' health is equally essential.
JAMA Network Open
10.1001/jamanetworkopen.2026.39400
Experimental study
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