Gaze-independent BCI-spelling using rapid serial visual presentation (RSVP)

Area of Science:

• Neuroscience
• Biomedical Engineering
• Human-Computer Interaction

Background:

• Brain Computer Interface (BCI) spellers are vital for communication in patients with neurodegenerative diseases.
• Existing spellers often require gaze control, posing challenges for patients with impaired oculo-motor function.
• Developing gaze-independent BCI spellers is crucial for enhancing communication accessibility.

Purpose of the Study:

• To investigate the efficacy of Rapid Serial Visual Presentation (RSVP) as a gaze-independent paradigm for mental typewriting.
• To evaluate the performance of an RSVP-based BCI speller in an online study.
• To determine if RSVP can provide a viable communication method for individuals with limited eye movement control.

Main Methods:

• An online study was conducted using an RSVP speller with a vocabulary of 30 symbols.
• The speller was tested under three conditions varying Stimulus Onset Asynchrony (SOA) and the use of color features.
• Symbols were presented sequentially at a fixed display location, requiring non-spatial visual attention.

Main Results:

• All twelve participants successfully operated the RSVP speller.
• The mean online spelling rate achieved was 1.43 symbols per minute.
• A high mean symbol selection accuracy of 94.8% was recorded in the optimal condition.

Conclusions:

• Rapid Serial Visual Presentation (RSVP) is a promising paradigm for Brain Computer Interface (BCI) spelling.
• The RSVP speller demonstrates competitive performance compared to existing gaze-independent spellers.
• This paradigm is suitable for patients with impaired oculo-motor control due to its non-reliance on gaze shifts.