EEG-based communication: presence of an error potential.

TitleEEG-based communication: presence of an error potential.
Publication TypeJournal Article
Year of Publication2000
AuthorsSchalk, G, Wolpaw, JR, McFarland, DJ, Pfurtscheller, G
JournalClin Neurophysiol
Date Published12/2000
KeywordsAdult, Brain, Brain Mapping, Electroencephalography, Evoked Potentials, Female, Humans, Male, Middle Aged, Research Design
Abstract BACKGROUND: EEG-based communication could be a valuable new augmentative communication technology for those with severe motor disabilities. Like all communication methods, it faces the problem of errors in transmission. In the Wadsworth EEG-based brain-computer interface (BCI) system, subjects learn to use mu or beta rhythm amplitude to move a cursor to targets on a computer screen. While cursor movement is highly accurate in trained subjects, it is not perfect. METHODS: In an effort to develop a method for detecting errors, this study compared the EEG immediately after correct target selection to that after incorrect selection. RESULTS: The data showed that a mistake is followed by a positive potential centered at the vertex that peaks about 180 ms after the incorrect selection. CONCLUSION: The results suggest that this error potential might provide a method for detecting and voiding errors that requires no additional time and could thereby improve the speed and accuracy of EEG-based communication.
Alternate JournalClin Neurophysiol
PubMed ID11090763
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