Brain stimulation review finds a small verbal-learning effect in schizophrenia
A pooled analysis found a small benefit on verbal-learning tests, while most other cognitive outcomes remained uncertain and study methods limited confidence.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The review found a small, statistically significant effect of transcranial direct current stimulation on verbal learning in people with schizophrenia or schizoaffective disorder. Results did not show a clear, consistent benefit across cognition more broadly. This abstract supports a narrow test-performance finding, without establishing improvements in daily functioning.
Studies used different stimulation protocols and had moderate risk of bias. The abstract does not specify control conditions, assessment timing or whether the test-score difference was meaningful in everyday life.
What researchers found
Standardized effect on verbal learning
Comparator and assessment timeframe were not reported in the abstract. Hedges' g expresses the effect on a standardized scale.
Individual trials and pooled results
The review examined a non-invasive brain-stimulation technique across several cognitive domains. Although working memory was often described as improved in individual trials, its pooled result was small and did not reach statistical significance.
Reading the protocol findings
The authors linked certain stimulation settings with better outcomes, but protocols differed across studies. Those patterns do not by themselves identify an optimal regimen or establish that changing a setting would improve a person's cognition.
The original publication
Transcranial direct current stimulation (tDCS) for cognitive impairment in schizophrenia: A systematic review and meta-analysis of randomized controlled trials.
García-Fernández L, Muñoz-Gualan AP, Romero-Ferreiro V et al.
Prog Neuropsychopharmacol Biol Psychiatry · 2025
- PubMed ID
- 41101579
- Record checked
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