Brain-stimulation review suggests memory gains, with unresolved questions about other outcomes
A review in older adults with cognitive impairment reported better memory and no clear attention benefit, but the overall-cognition statistics conflict.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The review suggests that transcranial alternating current stimulation may improve memory in older adults who already have cognitive impairment. It does not offer clear evidence of improved attention. Conflicting statistics make the overall-cognition result difficult to interpret, and the abstract gives no adverse-event details to substantiate its strong safety claim.
Comparison treatments, treatment duration, and adverse-event counts are absent. The overall-cognition statistics are internally inconsistent, and the authors call for more high-quality clinical studies.
Separate cognitive outcomes
The researchers pooled studies assessing memory, attention, broader cognitive performance, and safety. These are distinct outcomes: a favorable memory score does not establish improvement across cognition or in everyday functioning.
Conflicting statistical messages
For overall cognition, the confidence interval includes no difference between groups, but the reported significance test suggests a clear effect. Those statistical messages conflict, so the abstract alone cannot establish a reliable conclusion for that endpoint.
The original publication
Efficacy and safety of tACS in older adults with cognitive impairment: a systematic review and meta-analysis.
Ma S, Han Q, Zhang D et al.
Neurol Sci · 2026
- PubMed ID
- 41507453
- Record checked
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