Toward Improved P300 Speller Performance In Outdoor Environment Using Polarizer

P300, which is usually evoked by visual stimulus, is widely used in electroencephalography (EEG) based brain computer interface (BCI) studies. As an application-oriented BCI study, the P300 speller would inevitably be used in outdoor environments. However, the visual stimulation effect might be interfered by the reflections in outdoor environment. This paper attempted to improve the outdoor P300 speller performance by using polarizer. Six subjects participated our two experiments, each experiment was conducted three times under three different conditions. The results demonstrated that a suitable polarizer can indeed improve the performance of outdoor P300 speller.