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• W2321788085 abstract "Event Abstract Back to Event Dynamic effective connectivity analysis of goal-directed reaching Annette Witt1, 2, 3*, Demian Battaglia1, 3, Theo Geisel1, 3 and Alexander Gail1, 2 1 Leibniz Institute for Primate Research, German Primate Center, Germany 2 Max-Planck-Institute for Dynamics and Self-Organization, MPI, Germany 3 Bernstein Center for Computational Neuroscience, BCCN-G, Germany The interactions between cortical areas can be described by three different interdependent levels of connectivity: structural, functional, and effective. Two areas are structurally connected when there is a real anatomical connection between them, provided by long-range axonal projections. Functional connectivity refers to correlations between the studied neuronal populations. Functional connectivity is undirected, whereas Granger Causality analysis and its generalizations provide a description of directed inter-areal causal influences and thus extract an effective connectivity network from multivariate time-series of observed cortical activity. We consider paired recordings from two brain areas —Parietal Reach Region (PRR) and Dorsal Premotor Cortex (PMd)— in behaving macaque monkeys. In order to study how contextual information guides the mapping of sensory instructions onto different motor plans a memory-guided reaching task is used. Wavelet analysis of recorded LFPs exhibits significant time-dependent gamma-band activity in both areas. Causal interactions are assessed by means of regression-based Granger Causality in spectral domain, complemented with alternative estimations based on information-theoretical techniques. Our analyses uncovered that the effective connectivity between PRR and PMd is substantially affected by a change of the behavioural context. This connectivity is significantly stronger in pro-reach conditions than in anti-reach conditions, as revealed by highly enhanced Granger Causality in the gamma band. This is consistent with the hypothesis that PRR preferentially represents sensory-driven motor goals, which, during anti-reach tasks, have to be ignored in favour of inferred goals. Remarkably, modulations in the bispectral properties were not as important as changes in the directed causal influences, indicating that causal analyses can convey information on the dynamic organization of inter-areal interactions. Keywords: computational neuroscience Conference: Bernstein Conference on Computational Neuroscience, Berlin, Germany, 27 Sep - 1 Oct, 2010. Presentation Type: Presentation Topic: Bernstein Conference on Computational Neuroscience Citation: Witt A, Battaglia D, Geisel T and Gail A (2010). Dynamic effective connectivity analysis of goal-directed reaching. Front. Comput. Neurosci. Conference Abstract: Bernstein Conference on Computational Neuroscience. doi: 10.3389/conf.fncom.2010.51.00021 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: 21 Sep 2010; Published Online: 23 Sep 2010. * Correspondence: Dr. Annette Witt, Leibniz Institute for Primate Research, German Primate Center, Göttingen, Germany, annette.witt@nld.ds.mpg.de 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 Annette Witt Demian Battaglia Theo Geisel Alexander Gail Google Annette Witt Demian Battaglia Theo Geisel Alexander Gail Google Scholar Annette Witt Demian Battaglia Theo Geisel Alexander Gail PubMed Annette Witt Demian Battaglia Theo Geisel Alexander Gail 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." @default.
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• W2321788085 title "Dynamic effective connectivity analysis of goal-directed reaching" @default.
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