BCI-Based Rehabilitation on the Stroke in Sequela Stage

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Stroke is a primary cause of long-term disability globally.
• Many stroke survivors enter the chronic sequela stage, missing optimal recovery periods.
• Traditional rehabilitation may not fully restore motor function in chronic stroke patients.

Purpose of the Study:

• To investigate the efficacy of a motor imagery (MI)-based brain-computer interface (BCI) system combined with functional electrical stimulation (FES) for motor rehabilitation in chronic stroke patients.
• To evaluate the system's ability to provide closed-loop sensorimotor integration.
• To compare functional improvements between a BCI-FES group and a control group.

Main Methods:

• An MI-based BCI system processed electroencephalogram (EEG) signals to detect motor imagery intentions.
• Functional electrical stimulation (FES) was triggered by the BCI to provide sensory feedback for specific motor tasks (e.g., wrist dorsiflexion).
• Sixteen chronic stroke patients were randomized into a BCI-FES group or a control group, undergoing four weeks of rehabilitation.

Main Results:

• The BCI-FES group showed a significantly higher average improvement in motor function (Fugl-Meyer Assessment score) of 3.5 compared to the control group's 0.9.
• In patients with improved scores, EEG patterns demonstrated a trend toward centralization and shift to sensorimotor and premotor areas.
• The BCI-FES system facilitated sensorimotor integration, enhancing motor recovery.

Conclusions:

• The BCI-FES system effectively restored motor function in the upper extremities of chronic stroke patients.
• Patients in the BCI-FES group achieved greater functional gains than those in the control group.
• This approach offers a more autonomous and potentially more effective rehabilitation strategy for stroke survivors.