Changes in aperiodic EEG activity following acupuncture stimulation in stroke.

Can Acupuncture Change How the Brain Works After a Stroke?

A stroke can disrupt normal brain activity, often leaving one side of the brain less synchronized than the other. Researchers wanted to know whether acupuncture could help restore more balanced, healthy brain function — and they used a tool called an EEG (electroencephalogram) to measure brain electrical activity before and after treatment.

In this study, 30 people who had experienced a stroke received acupuncture stimulation while their brain activity was recorded. The researchers looked at two types of brain signals: rhythmic "oscillations" (regular brainwave patterns) and "aperiodic" activity (the background hum of overall brain function).

Here is what they found. After acupuncture, the brain showed stronger and faster alpha waves — a type of brainwave linked to relaxed focus and coordination — particularly in the areas affected by the stroke. At the same time, the background brain activity shifted in ways that suggested the brain's overall organization had changed. Importantly, the two sides of the brain became more symmetrical, meaning acupuncture appeared to help bring the stroke-affected side closer in line with the healthier side.

These findings matter because one of the biggest challenges after a stroke is "rewiring" the brain to compensate for damaged areas. This study suggests that acupuncture may support that process by nudging brain activity toward a more balanced and coordinated state. The researchers identified specific brain signal patterns that could one day serve as measurable markers to track how well acupuncture is working for stroke recovery.

While more research is needed, this study adds meaningful scientific evidence that acupuncture can produce real, measurable changes in the brain following a stroke.

If you or a loved one is recovering from a stroke, speak with a licensed acupuncturist who has experience working with neurological conditions.

This study investigated oscillatory and aperiodic EEG spectral features in 30 stroke patients following acupuncture stimulation. Using spectral parameterization, researchers separated periodic and aperiodic components of the power spectrum to isolate distinct neurophysiological signals.

Key findings: Acupuncture significantly increased alpha oscillation power and center frequency in the left fronto-parietal cortex, indicating enhanced synchronization in ipsilesional regions. Aperiodic analysis revealed widespread decreases in both the aperiodic exponent and offset — most prominently in the ipsilesional hemisphere — reflecting a shift in broadband spectral organization consistent with altered excitation/inhibition balance. Critically, acupuncture improved interhemispheric symmetry across alpha power, alpha center frequency, and the aperiodic exponent.

Clinical takeaway: Alpha center frequency, alpha power, and the aperiodic exponent are proposed as candidate EEG biomarkers for acupuncture-induced neuromodulation in stroke. These findings support the use of quantitative EEG as an objective outcome measure for acupuncture in post-stroke rehabilitation protocols.