Effect of a combination of flip and zooming stimuli on the performance of a visual brain-computer interface for spelling

Jiao Cheng, Jing Jin, Ian Daly, Yu Zhang, Bei Wang, Xingyu Wang, Andrzej Cichocki

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    Brain-computer interface (BCI) systems can allow their users to communicate with the external world by recognizing intention directly from their brain activity without the assistance of the peripheral motor nervous system. The P300-speller is one of the most widely used visual BCI applications. In previous studies, a flip stimulus (rotating the background area of the character) that was based on apparent motion, suffered from less refractory effects. However, its performance was not improved significantly. In addition, a presentation paradigm that used a "zooming" action (changing the size of the symbol) has been shown to evoke relatively higher P300 amplitudes and obtain a better BCI performance. To extend this method of stimuli presentation within a BCI and, consequently, to improve BCI performance, we present a new paradigm combining both the flip stimulus with a zooming action. This new presentation modality allowed BCI users to focus their attention more easily. We investigated whether such an action could combine the advantages of both types of stimuli presentation to bring a significant improvement in performance compared to the conventional flip stimulus. The experimental results showed that the proposed paradigm could obtain significantly higher classification accuracies and bit rates than the conventional flip paradigm (p<0.01).

    Original languageEnglish
    Pages (from-to)29-38
    Number of pages10
    JournalBiomedizinische Technik
    Volume64
    Issue number1
    DOIs
    Publication statusPublished - 1 Feb 2019

    Keywords

    • brain-computer interface (BCI) systems
    • combined paradigm
    • flip stimulus
    • zooming action

    Fingerprint

    Dive into the research topics of 'Effect of a combination of flip and zooming stimuli on the performance of a visual brain-computer interface for spelling'. Together they form a unique fingerprint.

    Cite this