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View all- Xu WGao PHe FQi H(2022)Improving the performance of a gaze independent P300-BCI by using the expectancy waveJournal of Neural Engineering10.1088/1741-2552/ac60c8Online publication date: 24-Mar-2022
Brain--computer interface (BCI): is it strictly necessary to use random sequences in visual spellers?
Authors: 
Manson Cheuk-Man Fong, James William Minett, Thierry Blu, William Shi-Yuan WangAuthors Info & Claims
Pages 109 - 118
Abstract
The P300 speller is a standard paradigm for brain--computer interfacing (BCI) based on electroencephalography (EEG). It exploits the fact that the user's selective attention to a target stimulus among a random sequence of stimuli enhances the magnitude of the P300 evoked potential. The present study questions the necessity of using random sequences of stimulation. In two types of experimental runs, subjects attended to a target stimulus while the stimuli, four in total, were each intensified twelve times, in either random order or deterministic order. The 32-channel EEG data were analyzed offline using linear discriminant analysis (LDA). Similar classification accuracies of 95.3% and 93.2% were obtained for the random and deterministic runs, respectively, using the data associated with 3 sequences of stimulation. Furthermore, using a montage of 5 posterior electrodes, the two paradigms attained identical accuracy of 92.4%. These results suggest that: (a) the use of random sequences is not necessary for effective BCI performance; and (b) deterministic sequences can be used in some BCI speller applications.
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Index Terms
- Brain--computer interface (BCI): is it strictly necessary to use random sequences in visual spellers?
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Published In
August 2012
312 pages
ISBN:9781450314961
DOI:10.1145/2350046
- General Chairs:
- Kentaro Go,
- Mitsuhiko Karashima,
- Program Chairs:
- Shin'ichi Fukuzumi,
- Xiangshi Ren
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Published: 28 August 2012
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August 28 - 31, 2012
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View all- Xu WGao PHe FQi H(2022)Improving the performance of a gaze independent P300-BCI by using the expectancy waveJournal of Neural Engineering10.1088/1741-2552/ac60c8Online publication date: 24-Mar-2022
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