Performance in myoelectric pattern recognition improves with transcranial direct current stimulation

Area of Science:

• Neuroscience
• Rehabilitation Engineering
• Human-Computer Interaction

Background:

• Sensorimotor impairments significantly affect quality of life, necessitating advanced rehabilitation strategies.
• Myoelectric pattern recognition (MPR) offers advanced control for assistive devices, but its effectiveness relies on efficient motor learning.
• Transcranial direct current stimulation (tDCS) is a non-invasive neuromodulation technique with potential to enhance motor learning.

Purpose of the Study:

• To investigate the effect of anodal transcranial direct current stimulation (tDCS) on myoelectric pattern recognition (MPR) performance in healthy individuals.
• To determine if tDCS can facilitate motor learning and improve control of MPR-based assistive devices.
• To assess tDCS efficacy on both dominant and non-dominant limbs.

Main Methods:

• A randomized crossover study involving 12 healthy participants.
• Participants performed an MPR task involving 11 hand/wrist movements under real-time decoding using the BioPatRec platform.
• Surface electromyography (EMG) was recorded, and performance was evaluated using a motion test during sham or anodal tDCS sessions.

Main Results:

• Transcranial direct current stimulation (tDCS) significantly enhanced MPR performance, particularly in the non-dominant limb.
• A 28% improvement in motion test completion rate was observed during tDCS (p-value: 0.023), supporting the enhancement of motor learning.
• The findings reject the null hypothesis, indicating tDCS's positive impact on MPR learning.

Conclusions:

• Transcranial direct current stimulation (tDCS) shows promise as an adjunctive tool for enhancing motor learning in the context of myoelectric pattern recognition (MPR).
• tDCS can potentially improve the rehabilitation outcomes and functional restoration for individuals using MPR-based assistive devices, such as myoelectric prostheses.
• Further research into tDCS protocols could optimize its application in neurorehabilitation settings.