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Performance Analysis With Different Types of Visual Stimuli in a BCI-Based Speller Under an RSVP Paradigm
Ricardo Ron-Angevin1, M Teresa Medina-Juliá1, Álvaro Fernández-Rodríguez1
1UMA-BCI Group, Departamento de Tecnología Electrónica, Universidad de Málaga, Malaga, Spain.
Frontiers in Computational Neuroscience
|January 20, 2021
Summary
Famous faces and neutral pictures improve Brain-Computer Interface (BCI) communication performance in non-gaze dependent paradigms. These visual stimuli, used in rapid serial visual presentation (RSVP) spellers, offer a promising alternative to traditional letter-based systems for individuals with motor impairments.
Area of Science:
- Neuroscience
- Rehabilitation Engineering
- Human-Computer Interaction
Background:
- Brain-Computer Interface (BCI) systems offer communication alternatives for individuals with severe motor disabilities.
- Non-gaze dependent BCI paradigms, particularly Rapid Serial Visual Presentation (RSVP), are gaining research interest.
- Existing visual modifications validated for Row-Column Presentation (RCP) BCIs require validation under RSVP.
Purpose of the Study:
- To assess the efficacy of different visual stimuli (white letters, famous faces, neutral pictures) within the RSVP paradigm.
- To compare the performance and user preference of various stimuli for non-gaze dependent BCI communication.
- To evaluate the potential of novel stimuli to enhance information transfer rates.
Main Methods:
- Eleven healthy subjects participated in a BCI experiment using the RSVP paradigm.
- Stimuli sets included white letters (WL), famous faces (FF), and neutral pictures (NP).
- Participants completed calibration, online performance, and subjective questionnaire phases.
Main Results:
- Famous faces (FF) and neutral pictures (NP) demonstrated superior performance during calibration and online phases compared to white letters (WL).
- FF stimuli showed a slight performance edge over NP stimuli in objective measures.
- Subjective questionnaires indicated a preference for NP stimuli over FF and WL, with NP scoring higher.
Conclusions:
- Famous faces and neutral pictures show promise for enhancing RSVP-based BCI spellers.
- These stimuli may increase information transfer rates compared to traditional letter-based stimuli.
- RSVP spellers utilizing FF or NP could offer a viable communication solution for individuals with motor function impairments.
