02357nas a2200205 4500008004100000022001400041245007700055210006900132260001200201490000700213520170000220100002401920700003201944700002401976700002202000700002102022700001902043700002102062856006802083 2023 eng d a1662-453X00aCharacterization of High-Gamma Activity in Electrocorticographic signals0 aCharacterization of HighGamma Activity in Electrocorticographic c08/20230 v173 aIntroduction: Electrocorticographic (ECoG) high-gamma activity (HGA) is a widely recognized and robust neural correlate of cognition and behavior. However, fundamental signal properties of HGA, such as the high-gamma frequency band or temporal dynamics of HGA, have never been systematically characterized. As a result, HGA estimators are often poorly adjusted, such that they miss valuable physiological information. Methods: To address these issues, we conducted a thorough qualitative and quantitative characterization of HGA in ECoG signals. Our study is based on ECoG signals recorded from 18 epilepsy patients while performing motor control, listening, and visual perception tasks. In this study, we first categorize HGA into HGA types based on the cognitive/behavioral task. For each HGA type, we then systematically quantify three fundamental signal properties of HGA: the high-gamma frequency band, the HGA bandwidth, and the temporal dynamics of HGA. Results: The high-gamma frequency band strongly varies across subjects and across cognitive/behavioral tasks. In addition, HGA time courses have lowpass character, with transients limited to 10 Hz. The task-related rise time and duration of these HGA time courses depend on the individual subject and cognitive/behavioral task. Task-related HGA amplitudes are comparable across the investigated tasks. Discussion: This study is of high practical relevance because it provides a systematic basis for optimizing experiment design, ECoG acquisition and processing, and HGA estimation. Our results reveal previously unknown characteristics of HGA, the physiological principles of which need to be investigated in further studies.1 aGruenwald, Johannes1 aSieghartsleitner, Sebastian1 aKapeller, Christoph1 aScharinger, Josef1 aKamada, Kyousuke1 aBrunner, Peter1 aGuger, Christoph uhttps://www.frontiersin.org/articles/10.3389/fnins.2023.120612001375nas a2200277 4500008004100000022001400041245009100055210006900146260000800215300001400223490000700237520056000244653001100804100001800815700002000833700002000853700002100873700002300894700001900917700002700936700002500963700002100988700002101009700001901030856004801049 2015 eng d a1525-506900aProceedings of the Seventh International Workshop on Advances in Electrocorticography.0 aProceedings of the Seventh International Workshop on Advances in cOct a312–3200 v513 aThe Seventh International Workshop on Advances in Electrocorticography (ECoG) convened in Washington, DC, on November 13-14, 2014. Electrocorticography-based research continues to proliferate widely across basic science and clinical disciplines. The 2014 workshop highlighted advances in neurolinguistics, brain-computer interface, functional mapping, and seizure termination facilitated by advances in the recording and analysis of the ECoG signal. The following proceedings document summarizes the content of this successful multidisciplinary gathering.10aHumans1 aRitaccio, A L1 aMatsumoto, Riki1 aMorrell, Martha1 aKamada, Kyousuke1 aKoubeissi, Mohamad1 aPoeppel, David1 aLachaux, Jean-Philippe1 aYanagisawa, Yakufumi1 aHirata, Masayuki1 aGuger, Christoph1 aSchalk, Gerwin uhttp://www.ncbi.nlm.nih.gov/pubmed/2632259401857nas a2200421 4500008004100000022001400041245008900055210006900144260001200213300001100225490000700236520059500243653001800838653002900856653003500885653002500920653002300945653004300968653003201011653002101043653002201064653001801086100001801104700001901122700002001141700001701161700002401178700001901202700002101221700002001242700002301262700002201285700001601307700002401323700002101347700001901368856004801387 2014 eng d a1525-506900aProceedings of the Fifth International Workshop on Advances in Electrocorticography.0 aProceedings of the Fifth International Workshop on Advances in E c12/2014 a183-920 v413 a
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.
10aBrain Mapping10abrain-computer interface10aelectrical stimulation mapping10aElectrocorticography10afunctional mapping10aGamma-frequency electroencephalography10aHigh-frequency oscillations10aNeuroprosthetics10aSeizure detection10aSubdural grid1 aRitaccio, A L1 aBrunner, Peter1 aGunduz, Aysegul1 aHermes, Dora1 aHirsch, Lawrence, J1 aJacobs, Joshua1 aKamada, Kyousuke1 aKastner, Sabine1 aKnight, Robert, T.1 aLesser, Ronald, P1 aMiller, Kai1 aSejnowski, Terrence1 aWorrell, Gregory1 aSchalk, Gerwin uhttp://www.ncbi.nlm.nih.gov/pubmed/25461213