Broadband high-frequency EEG power modulations vary with behavioral task

Abstract

Event Abstract Back to Event Broadband high-frequency EEG power modulations vary with behavioral task Julie A. Onton1*, Klaus Gramann1 and Scott Makeig1 1 UC San Diego, United States Broadband high frequency modulations of spectral power appear frequently in ECoG recordings from the cortical surface, but are typically considered difficult to differentiate from muscle when recorded from EEG scalp electrodes. Recently, we reported using independent component analysis (ICA) to find independent sources of EEG brain activity, followed by ICA decomposition of the spectrogram of each independent component process. This returned broadband high-frequency (bhf) modulations (~30 to 150-250 Hz) that were neither in phase nor co-modulated with broadband power fluctuations from scalp muscle activities. Further, mean bhf power levels from brain components exhibited different values when subjects were imagining various emotional states (Onton, 2009). Here, we collected EEG data during different behavioral task conditions to explore how and where bhf modulations were regulated under varying cognitive demands. In a letter two-back continuous performance task including auditory feedback signals after every manual response, bhf modulators in bilateral occipital areas showed a dip in power after feedback and before the next letter presentation. In the same task, left superior temporal IC phf power increased after 'incorrect' feedback. In a separate task involving a physical orienting response (head turn plus pointing) a bhf power in a frontal midline component cluster was activated during the acceleration phase of the head turn (Gramann, in preparation). These results show that broadband high frequency-modulations of power in source EEG activities are readily detectable in high-density scalp EEG recordings and are regulated differently depending on task demands. Funding: Supported by Swartz Foundation. Keywords: brain oscillations, EEG Conference: XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011. Presentation Type: Poster Presentation Topic: Poster Sessions: Quantitative Analysis of EEG, MEG & Brain Oscillations Citation: Onton JA, Gramann K and Makeig S (2011). Broadband high-frequency EEG power modulations vary with behavioral task. Conference Abstract: XI International Conference on Cognitive Neuroscience (ICON XI). doi: 10.3389/conf.fnhum.2011.207.00137 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 17 Nov 2011; Published Online: 28 Nov 2011. * Correspondence: Dr. Julie A Onton, UC San Diego, San Diego, United States, jonton@ucsd.edu Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Julie A Onton Klaus Gramann Scott Makeig Google Julie A Onton Klaus Gramann Scott Makeig Google Scholar Julie A Onton Klaus Gramann Scott Makeig PubMed Julie A Onton Klaus Gramann Scott Makeig Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.