Inter-hemispheric coupling changes associate with motor improvements after robotic stroke rehabilitation

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Brain plasticity is vital for motor recovery after stroke.
• Robot-aided neurorehabilitation offers a promising avenue for enhancing motor control in chronic stroke patients.

Purpose of the Study:

• To assess brain plastic reorganizations induced by robot-aided upper limb rehabilitation.
• To investigate the association between these brain changes and clinical improvements in chronic stroke survivors.

Main Methods:

• A 12-week upper-limb robot-aided rehabilitation program was administered to 7 chronic stroke patients.
• Evaluations included Fugl-Meyer Assessment (FMA) scores and robotic hand movement performance.
• Electroencephalography (EEG) measured resting-state brain activity and interhemispheric coherence (IHCoh) in primary somatosensory (S1) areas.

Main Results:

• Patients showed improved FMA scores and hand motor control performance post-rehabilitation.
• Significant changes in brain connectivity were observed in high-frequency rhythms (24-90 Hz).
• Improved motor performance correlated with normalized interhemispheric S1 coherence in the high beta band (24-33 Hz).

Conclusions:

• Robot-aided rehabilitation effectively improves motor performance in chronic stroke.
• This program induces measurable brain reorganizations, specifically enhancing interhemispheric connectivity in S1 areas.
• The observed brain changes correlate with enhanced hand control, suggesting a neuroplastic basis for robotic therapy's efficacy.