Motion-Based Rapid Serial Visual Presentation for Gaze-Independent Brain-Computer Interfaces

Abstract

Most event-related potential (ERP)-based brain-computer interface (BCI) spellers primarily usematrix layouts and generally require moderate eye movement for successful operation. The fundamental objective of this paper is to enhance the perceptibility of target characters by introducingmotion stimuli to classical rapid serial visual presentation (RSVP) spellers that do not require any eye movement, thereby applying them to paralyzed patients with oculomotor dysfunctions. To test the feasibility of the proposed motion-based RSVP paradigm, we implemented three RSVP spellers: 1) fixed-direction motion (FM-RSVP); 2) random-directionmotion (RM-RSVP); and 3) (the conventional) non-motion stimulation (NM-RSVP), and evaluated the effect of the three different stimulation methods on spelling performance. The two motion-based stimulation methods, FM-and RM-RSVP, showed shorter P300 latency and higher P300 amplitudes (i.e., 360.4-379.6 ms; 5.5867-5.7662 mu V) than the NM-RSVP (i.e., 480.4 ms; 4.7426 mu V). This led to higher andmore stable performances for FM-and RM-RSVP spellers than NM-RSVP speller (i.e., 79.06 +/- 6.45% for NM-RSVP, 90.60 +/- 2.98% for RM-RSVP, and 92.74 +/- 2.55% for FM-RSVP). In particular, the proposed motion-based RSVP paradigm was significantly beneficial for about half of the subjects who might not accurately perceive rapidly presented static stimuli. These results indicate that the use of proposed motion-based RSVP paradigm is more beneficial for target recognitionwhen developing BCI applications for severely paralyzed patients with complex ocular dysfunctions.