Motor recovery after stroke remains the central problem of neurorehabilitation. Conventional therapy depends on repetition and intensity, both of which are limited by patient fatigue, therapist availability and the density of stroke rehabilitation services — a particularly acute constraint in India. Three published trials from our group examined whether technology-assisted stimulation can raise the ceiling.
Frequency-tuned electromagnetic field therapy
A pilot randomised controlled trial published in Frontiers in Neurology (2022) examined frequency-tuned electromagnetic field therapy for post-stroke motor function. The premise is that extremely low frequency electromagnetic fields, tuned to specific frequencies, can modulate cortical excitability in a way that makes subsequent motor practice more productive.
BCI-based stimulation devices
A second pilot randomised controlled trial, published in Brain Stimulation (2021;14(6):1715), evaluated a novel brain–computer interface-based stimulation device in sub-acute ischemic stroke, with disability as the outcome of interest. A BCI approach is attractive here because it couples stimulation to the patient's own movement intention rather than delivering it on a fixed schedule — closing a loop that open-loop stimulation leaves open.
Artificial intelligence–powered delivery
The third study, presented at the World Stroke Congress and published in Stroke (2021;52(Suppl 1)), examined artificial intelligence–powered electromagnetic field therapy for upper limb recovery. Upper limb function is consistently the more stubborn recovery target after stroke, and the one with the greatest impact on independence in daily activity.
Reading these results honestly
All three are pilot studies. They establish feasibility and provide effect estimates for powering larger trials; they do not establish these methods as standard care, and should not be presented to patients as though they did. The appropriate clinical position is that technology-assisted stimulation is a promising adjunct to intensive conventional therapy, not a replacement for it.
The access question
There is a second reason this line of work matters in the Indian context. Specialist stroke rehabilitation remains concentrated in urban tertiary centres. Any intervention that increases the productivity of each therapy hour, or that can be delivered through telerehabilitation, addresses a distribution problem as much as a clinical one. That reasoning also motivated our Japan–India telerehabilitation randomised controlled trial with Digireha, completed in 2025.
