Cited by 652EEG and Brain-Computer InterfacesGaze Tracking and Assistive TechnologyTactile and Sensory Interactions

How many people are able to control a P300-based brain-computer interface (BCI)?

Guger, Christoph, Daban, Shahab, Sellers, Eric, Holzner, Clemens, Krausz, Gunther, Carabalona, Roberta, Gramatica, Furio, Edlinger, Guenter·2009·Neuroscience Letters

Abstract

An EEG-based brain-computer system can be used to control external devices such as computers, wheelchairs or Virtual Environments. One of the most important applications is a spelling device to aid severely disabled individuals with communication, for example people disabled by amyotrophic lateral sclerosis (ALS). P300-based BCI systems are optimal for spelling characters with high speed and accuracy, as compared to other BCI paradigms such as motor imagery. In this study, 100 subjects tested a P300-based BCI system to spell a 5-character word with only 5 min of training. EEG data were acquired while the subject looked at a 36-character matrix to spell the word WATER. Two different versions of the P300 speller were used: (i) the row/column speller (RC) that flashes an entire column or row of characters and (ii) a single character speller (SC) that flashes each character individually. The subjects were free to decide which version to test. Nineteen subjects opted to test both versions. The BCI system classifier was trained on the data collected for the word WATER. During the real-time phase of the experiment, the subject spelled the word LUCAS, and was provided with the classifier selection accuracy after each of the five letters. Additionally, subjects filled out a questionnaire about age, sex, education, sleep duration, working duration, cigarette consumption, coffee consumption, and level of disturbance that the flashing characters produced. 72.8% (N=81) of the subjects were able to spell with 100% accuracy in the RC paradigm and 55.3% (N=38) of the subjects spelled with 100% accuracy in the SC paradigm. Less than 3% of the subjects did not spell any character correctly. People who slept less than 8h performed significantly better than other subjects. Sex, education, working duration, and cigarette and coffee consumption were not statistically related to differences in accuracy. The disturbance of the flashing characters was rated with a median score of 1 on a scale from 1 to 5 (1, not disturbing; 5, highly disturbing). This study shows that high spelling accuracy can be achieved with the P300 BCI system using approximately 5 min of training data for a large number of non-disabled subjects, and that the RC paradigm is superior to the SC paradigm. 89% of the 81 RC subjects were able to spell with accuracy 80-100%. A similar study using a motor imagery BCI with 99 subjects showed that only 19% of the subjects were able to achieve accuracy of 80-100%. These large differences in accuracy suggest that with limited amounts of training data the P300-based BCI is superior to the motor imagery BCI. Overall, these results are very encouraging and a similar study should be conducted with subjects who have ALS to determine if their accuracy levels are similar.

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Crossref · 10.1016/j.neulet.2009.06.045

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  • General concerns about non-universal usability, robustness, and the role of training raised by able-bodied user studies are even more pressing with regard to end-user populations.

    “As a result, the general concerns about the non-universal usability, robustness, and, especially, the role of training raised by able-bodied user studies [3–7] are even more pressing with regard to end-user populations.”

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Authors
Guger, C., Daban, S., Sellers, E., Holzner, C., Krausz, G., Carabalona, R., Gramatica, F., & Edlinger, G.
Affiliations
  • Guger Technologies (Austria) (AT)
  • East Tennessee State University (US)
  • Don Carlo Gnocchi Foundation (IT)
Corresponding author
Guger, Christoph
Venue
Neuroscience Letters
Publisher
Elsevier BV
Published
2009-09
Volume
462
Issue
1
Pages
94-98
ISSN
0304-3940 (ISSN-L)
OpenAlex
W2168765820
Cited by
652
References
16
Citations by year
2026: 9 · 2025: 18 · 2024: 13 · 2023: 19 · 2022: 23 · 2021: 30 · 2020: 33 · 2019: 47 · 2018: 51 · 2017: 46 · 2016: 42 · 2015: 47 · 2014: 51 · 2013: 51 · 2012: 63
FWCI
27.74
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience Letters (publishedVersion)
  • PubMed (publishedVersion)
  • Digital Commons - East Tennessee State University (East Tennessee State University) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › EEG and Brain-Computer Interfaces
  • Physical Sciences › Computer Science › Human-Computer Interaction › Gaze Tracking and Assistive Technology
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Tactile and Sensory Interactions
Keywords
P300, brain-computer interface, P300 speller, spelling accuracy, EEG-based communication, sleep duration, user acceptance, amyotrophic lateral sclerosis, assistive technology for people with disabilities
MeSH terms
Adult, Biofeedback, Psychology, Brain, Electroencephalography, Female, Humans, Male, Neuropsychological Tests, Practice, Psychological, Surveys and Questionnaires, Signal Processing, Computer-Assisted, User-Computer Interface, Writing, Event-Related Potentials, P300

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