Associative brain-computer interface training increases wrist extensor corticospinal excitability in patients with...

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Stroke often leads to upper limb weakness, impacting daily function.
• Current rehabilitation strategies can be enhanced by neurotechnological interventions.
• Associative learning principles can be leveraged to improve motor recovery.

Purpose of the Study:

• To investigate the effect of an associative brain-computer interface (BCI) on corticospinal excitability in subacute stroke patients with upper limb weakness.
• To determine if precisely timed peripheral nerve stimulation, guided by electroencephalography (EEG), can enhance motor cortex activity.
• To compare the effects of the associative BCI intervention with a sham control in a randomized controlled trial.

Main Methods:

• A randomized controlled trial involving 24 subacute stroke patients with upper limb weakness.
• An intervention group received 30 pairings of peripheral nerve stimulation timed to the movement-related cortical potential (MRCP) peak, identified via EEG.
• A sham group received sub-perceptual stimulation, with both groups performing wrist extensions.

Main Results:

• Patients in the associative BCI group showed significantly increased motor-evoked potential amplitudes immediately after training, indicating enhanced corticospinal excitability.
• These improvements in corticospinal excitability persisted for at least 30 minutes post-intervention.
• No significant changes were observed in the sham control group.

Conclusions:

• A single session of associative BCI training significantly increases corticospinal excitability in the upper limb of stroke survivors.
• This finding supports the potential of associative BCI as an augmentation strategy for upper limb stroke rehabilitation.
• The study demonstrates the efficacy of EEG-guided, timed peripheral stimulation for enhancing motor cortex function in upper limb recovery.