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Efficacy of Transcranial Direct Current Stimulation and Photobiomodulation in Improving Cognitive Abilities for Alzheimer's Disease: A Systematic Review.

J Clin Med · 2025 · PMC11900501 · PMID 40095881

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likely to be significantno p-value reported
In his 2021 study, the findings indicated that while tDCS can positively affect EEG patterns, the effects are likely to be significant only after a long-term intervention of eight months.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.