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Design of auditory P300-based brain-computer interfaces with a single auditory channel and no visual support.
Yun-Joo Choi1, Oh-Sang Kwon1, Sung-Phil Kim1
1Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919 Korea.
Cognitive Neurodynamics
|November 17, 2023
Summary
Natural sounds enhance auditory brain-computer interfaces (BCIs) more than artificial ones. However, visual stimuli still outperform auditory P300-based BCIs, suggesting personalized sound selection and dynamic ERP amplitude differences are key for improvement.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Human-Computer Interaction
Background:
- Non-invasive brain-computer interfaces (BCIs) commonly use P300 event-related potentials (ERPs) with visual stimuli.
- Auditory BCIs are needed for individuals with visual impairments or unreliable gaze control.
- Optimizing auditory stimuli is crucial for expanding BCI applications.
Purpose of the Study:
- To design optimal auditory stimuli (natural vs. artificial sounds) for P300-based BCIs.
- To compare the performance of auditory and visual P300-based BCIs.
- To investigate differences in ERP spatiotemporal patterns between auditory and visual stimuli.
Main Methods:
- Compared online BCI performance using artificial (beeps) and natural (human voice, animal sounds) auditory stimuli.
- Investigated differences in P300 ERP amplitudes between target and non-target stimuli.
- Compared performance and ERP characteristics of auditory versus visual P300-based BCIs.
Main Results:
- Natural sounds improved auditory BCI performance and ERP amplitude differences compared to artificial sounds.
- Individual subject preferences varied between human voice and animal sounds.
- Visual stimuli achieved higher BCI performance (77.56%) than auditory stimuli (54.67%).
- ERP differences showed more dynamic spatiotemporal patterns for visual stimuli.
Conclusions:
- Natural auditory stimuli, personalized to the user, can enhance P300-based BCIs.
- Making ERP amplitude differences more dynamic may further improve auditory BCIs.
- Visual stimuli remain superior for P300-based BCI performance currently.
