Transcranial Direct Current Stimulation-Based Neuromodulation Improves the Performance of Brain-Computer Interfaces...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Brain-Computer Interfaces (BCIs)

Background:

• Brain state estimation and intervention are crucial for advancing brain-computer interface (BCI) utility.
• Transcranial direct current stimulation (tDCS) is a neuromodulation technique with potential applications in BCIs.

Purpose of the Study:

• To investigate the efficacy of tDCS in improving steady-state visual evoked potential (SSVEP)-based BCIs.
• To introduce a novel method for estimating neuromodulation-induced changes in brain arousal for SSVEP-BCIs.

Main Methods:

• Comparison of EEG oscillations and fractal characteristics under pre-stimulation, sham-tDCS, and anodal-tDCS conditions.
• Development and application of a new brain state estimation method to quantify tDCS effects on arousal.

Main Results:

• Anodal-tDCS significantly increased SSVEP amplitude, leading to improved SSVEP-BCI performance.
• Fractal feature analysis confirmed that tDCS, especially anodal-tDCS, enhances brain state arousal.
• The novel brain state estimation method effectively quantified tDCS-induced arousal changes.

Conclusions:

• tDCS, particularly anodal-tDCS, is a viable method for enhancing SSVEP-BCI performance.
• Neuromodulation via tDCS can modulate brain arousal, offering personalized interventions for BCIs.
• The developed brain state monitoring method provides an objective tool for EEG modeling in SSVEP-BCIs.