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

Cheng, J and Jin, J and Daly, Ian and Zhang, Y and Wang, B and Wang, X and Cichocki, A (2018) 'Effect of a combination of flip and zooming stimuli on the performance of a visual brain-computer interface for spelling.' Biomedical Engineering / Biomedizinische Technik. ISSN 0013-5585

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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).

Item Type: Article
Uncontrolled Keywords: brain-computer interface (BCI) systems; combined paradigm; flip stimulus; zooming action
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions: Faculty of Science and Health > Computer Science and Electronic Engineering, School of
Depositing User: Elements
Date Deposited: 29 Jun 2018 16:15
Last Modified: 24 Sep 2019 15:15
URI: http://repository.essex.ac.uk/id/eprint/22340

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