%0 Journal Article %J Epilepsy Behav %D 2014 %T Proceedings of the Fifth International Workshop on Advances in Electrocorticography. %A A L Ritaccio %A Peter Brunner %A Gunduz, Aysegul %A Hermes, Dora %A Hirsch, Lawrence J %A Jacobs, Joshua %A Kamada, Kyousuke %A Kastner, Sabine %A Robert T. Knight %A Lesser, Ronald P %A Miller, Kai %A Sejnowski, Terrence %A Worrell, Gregory %A Gerwin Schalk %K Brain Mapping %K brain-computer interface %K electrical stimulation mapping %K Electrocorticography %K functional mapping %K Gamma-frequency electroencephalography %K High-frequency oscillations %K Neuroprosthetics %K Seizure detection %K Subdural grid %X

The Fifth International Workshop on Advances in Electrocorticography convened in San Diego, CA, on November 7-8, 2013. Advancements in methodology, implementation, and commercialization across both research and in the interval year since the last workshop were the focus of the gathering. Electrocorticography (ECoG) is now firmly established as a preferred signal source for advanced research in functional, cognitive, and neuroprosthetic domains. Published output in ECoG fields has increased tenfold in the past decade. These proceedings attempt to summarize the state of the art.

%B Epilepsy Behav %V 41 %P 183-92 %8 12/2014 %G eng %U http://www.ncbi.nlm.nih.gov/pubmed/25461213 %R 10.1016/j.yebeh.2014.09.015 %0 Journal Article %J Epilepsy Behav %D 2012 %T Proceedings of the Third International Workshop on Advances in Electrocorticography. %A A L Ritaccio %A Beauchamp, Michael %A Bosman, Conrado %A Peter Brunner %A Chang, Edward %A Nathan E. Crone %A Gunduz, Aysegul %A Disha Gupta %A Robert T. Knight %A Leuthardt, Eric %A Litt, Brian %A Moran, Daniel %A Ojemann, Jeffrey %A Parvizi, Josef %A Ramsey, Nick %A Rieger, Jochem %A Viventi, Jonathan %A Voytek, Bradley %A Williams, Justin %A Gerwin Schalk %K Brain Mapping %K brain-computer interface %K Electrocorticography %K Gamma-frequency electroencephalography %K high-frequency oscillation %K Neuroprosthetics %K Seizure detection %K Subdural grid %X The Third International Workshop on Advances in Electrocorticography (ECoG) was convened in Washington, DC, on November 10-11, 2011. As in prior meetings, a true multidisciplinary fusion of clinicians, scientists, and engineers from many disciplines gathered to summarize contemporary experiences in brain surface recordings. The proceedings of this meeting serve as evidence of a very robust and transformative field but will yet again require revision to incorporate the advances that the following year will surely bring. %B Epilepsy Behav %V 25 %P 605-13 %8 12/2012 %G eng %U http://www.ncbi.nlm.nih.gov/pubmed/23160096 %N 4 %R 10.1016/j.yebeh.2012.09.016 %0 Journal Article %J Front Neurosci %D 2011 %T Rapid Communication with a "P300" Matrix Speller Using Electrocorticographic Signals (ECoG). %A Peter Brunner %A A L Ritaccio %A Emrich, Joseph F %A H Bischof %A Gerwin Schalk %K brain-computer interface %K Electrocorticography %K event-related potential %K P300 %K speller %X

brain-computer interface (BCI) can provide a non-muscular communication channel to severely disabled people. One particular realization of a BCI is the P300 matrix speller that was originally described by Farwell and Donchin (1988). This speller uses event-related potentials (ERPs) that include the P300 ERP. All previous online studies of the P300 matrix speller used scalp-recorded electroencephalography (EEG) and were limited in their communication performance to only a few characters per minute. In our study, we investigated the feasibility of using electrocorticographic (ECoG) signals for online operation of the matrix speller, and determined associated spelling rates. We used the matrix speller that is implemented in the BCI2000 system. This speller used ECoG signals that were recorded from frontal, parietal, and occipital areas in one subject. This subject spelled a total of 444 characters in online experiments. The results showed that the subject sustained a rate of 17 characters/min (i.e., 69 bits/min), and achieved a peak rate of 22 characters/min (i.e., 113 bits/min). Detailed analysis of the results suggests that ERPs over visual areas (i.e., visual evoked potentials) contribute significantly to the performance of the matrix speller BCI system. Our results also point to potential reasons for the apparent advantages in spelling performance of ECoG compared to EEG. Thus, with additional verification in more subjects, these results may further extend the communication options for people with serious neuromuscular disabilities.

%B Front Neurosci %V 5 %P 5 %8 02/2011 %G eng %U http://www.ncbi.nlm.nih.gov/pubmed/21369351 %R 10.3389/fnins.2011.00005