Combined rTMS and virtual reality brain-computer interface training for motor recovery after stroke

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Stroke often results in lasting motor impairment due to altered brain activity, specifically exaggerated inhibition from the contralesional hemisphere.
• Repetitive transcranial magnetic stimulation (rTMS) can modulate cortical excitability, while brain-computer interface (BCI) training facilitates motor relearning.
• Combining rTMS and BCI may offer a synergistic approach to address post-stroke motor deficits by rebalancing interhemispheric activity.

Purpose of the Study:

• To evaluate the efficacy of combined rTMS and BCI training for motor recovery in chronic stroke survivors with persistent motor paresis.
• To compare the effects of real rTMS + BCI versus sham rTMS + BCI on motor function and neurophysiological markers.
• To assess the contribution of BCI training alone to motor rehabilitation.

Main Methods:

• Three chronic stroke participants underwent a 6-week protocol: 3 weeks of combined real or sham rTMS + BCI, followed by 3 weeks of BCI alone.
• Behavioral assessments, functional magnetic resonance imaging (fMRI), and electrophysiological measures were used to evaluate motor recovery.
• BCI performance and control of a virtual reality paradigm were monitored throughout the study.

Main Results:

• Both real rTMS + BCI and sham rTMS + BCI groups showed motor improvements.
• The real rTMS + BCI group exhibited significant improvements in inter-hemispheric inhibition and increased ipsilesional cortical activation (fMRI).
• Only the real rTMS + BCI group demonstrated significant advancements in BCI performance and control over the virtual reality task.

Conclusions:

• Combined rTMS + BCI is a feasible and effective strategy for enhancing motor recovery after stroke, particularly when real rTMS is applied.
• The treatment promotes increased ipsilesional motor activity and behavioral functional gains.
• BCI training alone also contributes to motor improvements, highlighting its utility in rehabilitation.