Event Abstract Back to Event MEG source imaging reveals robust sound induced low-frequency power decreases in the auditory cortex validated with intracerebral EEG Sarang S. Dalal1*, Nathan Weisz1, Aurélie Bidet-Caulet2, Françoise Lecaignard2, 3 and Olivier Bertrand2 1 University of Konstanz, Germany 2 INSERM U1028, CNRS UMR5292, France 3 CERMEP, France Despite some supportive data, the existence of an attention-modulated alpha-like rhythm in auditory cortex is still controversial. In order to settle this issue, we analyzed sound-induced alpha desynchronization using advanced MEG source imaging and compared the locus of the main generators with data gained from intracerebral EEG (iEEG) recordings using an identical paradigm. MEG/iEEG recordings were obtained while subjects performed an auditory discrimination task. The stimuli consisted of 50 ms tones, with frequently occurring standards (1000 Hz tone) and less frequently occurring distractors (1080 Hz) and targets (1040 Hz). A time-frequency beamformer was used to reconstruct and image spectral power modulations. In parallel to traditional evoked responses, significant beta band power decreases relative to pre-stimulus baseline were observed in bilateral auditory cortex, peaking at approximately 200 ms post-stimulus, followed by alpha band power decreases, peaking at approximately 500 ms. Frequency bands as well as source locations corresponded well with similar desynchronization effects found with iEEG. Taken together, our results strongly support the idea of ongoing alpha and beta activity in auditory cortex that is suppressed by an incoming sound. Importantly, we show that these processes can be monitored noninvasively using advanced source analysis methods. Funding: Supported by European Commission FP7 Grant PIIF-GA-2008-221097. Keywords: Cognition, MEG Conference: XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011. Presentation Type: Poster Presentation Topic: Poster Sessions: Neurophysiology of Cognition and Attention Citation: Dalal SS, Weisz N, Bidet-Caulet A, Lecaignard F and Bertrand O (2011). MEG source imaging reveals robust sound induced low-frequency power decreases in the auditory cortex validated with intracerebral EEG. Conference Abstract: XI International Conference on Cognitive Neuroscience (ICON XI). doi: 10.3389/conf.fnhum.2011.207.00485 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: 25 Nov 2011; Published Online: 28 Nov 2011. * Correspondence: Dr. Sarang S Dalal, University of Konstanz, Konstanz, Germany, sarang@frontiersin.org 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 Sarang S Dalal Nathan Weisz Aurélie Bidet-Caulet Françoise Lecaignard Olivier Bertrand Google Sarang S Dalal Nathan Weisz Aurélie Bidet-Caulet Françoise Lecaignard Olivier Bertrand Google Scholar Sarang S Dalal Nathan Weisz Aurélie Bidet-Caulet Françoise Lecaignard Olivier Bertrand PubMed Sarang S Dalal Nathan Weisz Aurélie Bidet-Caulet Françoise Lecaignard Olivier Bertrand 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.