fNIRS-based wavelet metrics effectively detect intervention-dependent modulation of cortical hemodynamics and network organization, highlighting the value of optical neuroimaging in assessing neuroplasticity during stroke rehabilitation.
The PES-BAT paradigm elicited augmented hemodynamic activation in ipsilesional prefrontal and motor regions compared with BAT alone.
The combined PES-BAT intervention enhanced phase synchronization across distributed cortical networks.
The PES-BAT paradigm preserved interhemispheric coherence and counteracted maladaptive contralesional dominance.
fNIRS-based wavelet metrics were able to detect intervention-dependent modulation of both cortical hemodynamics and network organization.
Peripheral electrical stimulation combined with bilateral arm training (PES-BAT) was studied as a sensory-primed rehabilitation paradigm in subacute stroke patients.
This research suggests that combining electrical stimulation of the limbs (peripheral electrical stimulation, or PES) with bilateral arm training (BAT) — a rehabilitation approach where both arms are exercised together — produces measurable changes in brain activity patterns after stroke. Using a brain imaging technique called functional near-infrared spectroscopy (fNIRS), which measures blood flow changes in the brain using light, the researchers found that the combined approach activated more brain regions on the same side as the stroke damage, particularly in areas related to movement and planning, compared to arm training alone. The study also found that the two brain hemispheres communicated more effectively with each other under the combined treatment, reducing an imbalance where the unaffected side of the brain can sometimes become overly dominant after stroke. This research suggests that adding sensory stimulation to physical arm rehabilitation may help rewire the brain more effectively during the critical subacute recovery period after stroke, which is typically the first few weeks to months after the event. The use of fNIRS as a monitoring tool appears promising for detecting these brain network changes in a clinical rehabilitation setting, as it is portable and relatively tolerant of movement compared to other brain imaging methods. The findings contribute to understanding how the brain reorganizes itself during stroke recovery (neuroplasticity) and suggest that the type and combination of rehabilitation activities matter for promoting recovery-related brain changes. However, as this was a relatively small study of 24 patients, further research with larger groups and clinical outcome measures would be needed to confirm whether these brain-level changes translate into better functional recovery for patients.
Li W, Wang B, Zhang Q, Wei R, Huo C. (2026). fNIRS-Based Network Signatures of Sensory-Primed Bilateral Arm Training in Subacute Stroke Recovery.. Journal of biophotonics. https://doi.org/10.1002/jbio.70353