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Effect of the Green/Blue Flicker Matrix for P300-Based Brain-Computer Interface: An EEG-fMRI Study
Shiro Ikegami1, Kouji Takano, Makoto Wada
1Systems Neuroscience Section, Department of Rehabilitation for Brain Functions, Research Institute of National Rehabilitation Center for Persons with Disabilities Tokorozawa, Japan.
Frontiers in Neurology
|July 17, 2012
Summary
The green/blue flicker matrix in brain-computer interfaces (BCI) enhances P300 responses more than the traditional white/gray matrix. This visual BCI improvement is linked to increased brain activity in parietal and occipital regions.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Human-Computer Interaction
Background:
- Visual P300-brain-computer interfaces (BCI) use P300 potentials for icon selection via flicker matrices.
- Conventional P300-BCI spellers use white/gray luminance intensification.
- Previous work indicated improved performance and comfort with green/blue luminance/chromatic flicker matrices.
Purpose of the Study:
- To identify brain areas showing enhanced activation with a green/blue flicker matrix compared to a white/gray matrix in P300-BCI.
- To correlate enhanced brain activity with improved P300-BCI performance.
Main Methods:
- Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) recordings.
- Comparison of EEG P300 amplitudes and fMRI activation patterns between green/blue and white/gray flicker matrix conditions.
- Analysis focused on parietal and occipital brain regions.
Main Results:
- EEG data showed larger P300 peak amplitudes at parietal and occipital electrodes under the green/blue condition.
- fMRI revealed greater activation in bilateral parietal and occipital cortices, especially in the right hemisphere, with the green/blue matrix.
- The enhanced activation regions were consistent with areas involved in conventional P300 processing.
Conclusions:
- The green/blue flicker matrix effectively enhances P300 responses in visual BCI.
- Increased neural activity in parietal and occipital regions underlies the improved performance observed with the green/blue matrix.
- This visual stimulus offers a promising avenue for optimizing P300-BCI systems.
