Voluntary brain regulation and communication with electrocorticogram signals.

TitleVoluntary brain regulation and communication with electrocorticogram signals.
Publication TypeJournal Article
Year of Publication2008
AuthorsHinterberger, T, Widman, G, Lal, TN, Jeremy Jeremy Hill, Tangermann, M, Rosenstiel, W, Schölkopf, B, Elger, C, Birbaumer, N
JournalEpilepsy Behav
Date Published08/2008
KeywordsAdult, Biofeedback, Psychology, Cerebral Cortex, Communication Aids for Disabled, Dominance, Cerebral, Electroencephalography, Epilepsies, Partial, Female, Humans, Imagination, Male, Middle Aged, Motor Activity, Motor Cortex, Signal Processing, Computer-Assisted, Software, Somatosensory Cortex, Theta Rhythm, User-Computer Interface, Writing

Brain-computer interfaces (BCIs) can be used for communication in writing without muscular activity or for learning to control seizures by voluntary regulation of brain signals such as the electroencephalogram (EEG). Three of five patients with epilepsy were able to spell their names with electrocorticogram (ECoG) signals derived from motor-related areas within only one or two training sessions. Imagery of finger or tongue movements was classified with support-vector classification of autoregressive coefficients derived from the ECoG signals. After training of the classifier, binary classification responses were used to select letters from a computer-generated menu. Offline analysis showed increased theta activity in the unsuccessful patients, whereas the successful patients exhibited dominant sensorimotor rhythms that they could control. The high spatial resolution and increased signal-to-noise ratio in ECoG signals, combined with short training periods, may offer an alternative for communication in complete paralysis, locked-in syndrome, and motor restoration.

Alternate JournalEpilepsy Behav
PubMed ID18495541

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