Frequency-specific modulation of motor cortical excitability by transcranial alternating current stimulation.
Lei Tingting, Chen Lilin, Wang Chuangjia and 5 others
PMID 40148968WHAT IT FOUND
In healthy adults, 70 Hz brain stimulation increased motor excitability and shortened reaction times compared to sham.
No behavioral changes were tested, so this confirms a physiological effect but does not prove improved motor function.
Key findings
01Gamma-tACS significantly increased MEP amplitudes compared to sham-tACS.
02Gamma-tACS resulted in shorter MEP latencies than both sham-tACS and beta-tACS.
03The study did not include any motor task assessment to measure behavioral changes.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
Participants were healthy young adults (mean age 23.33 years), not stroke survivors. No motor behavior or functional tasks were assessed, so it is unknown if these brain changes improve movement. The study only measured immediate effects after one session, not long-term recovery. Small sample size of 18 participants. Only 10 MEP trials were collected per condition, which may affect reliability.
Declared interests
Funded by the National Key R&D Program of China, the National Natural Science Foundation of China, and the Science and Technology Projects in Guangzhou. The authors declared no conflicts of interest.
The easy way to misread this
Do not interpret the increased MEP amplitudes as evidence that gamma-tACS improves motor function in stroke patients. The study was conducted on healthy adults and did not measure any behavioral outcomes or motor skills.