English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/116145
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

Modeling positive Granger causality and negative phase lag between cortical areas

AuthorsMatias, Fernanda S. ; Gollo, Leonardo L.; Carelli, Pedro V.; Bressler, Steven L.; Copelli, Mauro; Mirasso, Claudio R.
Issue Date1-Oct-2014
PublisherElsevier
CitationNeuroImage 99: 411-418 (2014)
AbstractDifferent measures of directional influence have been employed to infer effective connectivity in the brain. When the connectivity between two regions is such that one of them (the sender) strongly influences the other (the receiver), a positive phase lag is often expected. The assumption is that the time difference implicit in the relative phase reflects the transmission time of neuronal activity. However, Brovelli et al. (2004) observed that, in monkeys engaged in processing a cognitive task, a dominant directional influence from one area of sensorimotor cortex to another may be accompanied by either a negative or a positive time delay. Here we present a model of two brain regions, coupled with a well-defined directional influence, that displays similar features to those observed in the experimental data. This model is inspired by the theoretical framework of Anticipated Synchronization developed in the field of dynamical systems. Anticipated Synchronization is a form of synchronization that occurs when a unidirectional influence is transmitted from a sender to a receiver, but the receiver leads the sender in time. This counterintuitive synchronization regime can be a stable solution of two dynamical systems coupled in a master-slave (sender-receiver) configuration when the slave receives a negative delayed self-feedback. Despite efforts to understand the dynamics of Anticipated Synchronization, experimental evidence for it in the brain has been lacking. By reproducing experimental delay times and coherence spectra, our results provide a theoretical basis for the underlying mechanisms of the observed dynamics, and suggest that the primate cortex could operate in a regime of Anticipated Synchronization as part of normal neurocognitive function. © 2014 Elsevier Inc.
Publisher version (URL)http://dx.doi.org/10.1016/j.neuroimage.2014.05.063
URIhttp://hdl.handle.net/10261/116145
DOI10.1016/j.neuroimage.2014.05.063
Identifiersdoi: 10.1016/j.neuroimage.2014.05.063
issn: 1095-9572
Appears in Collections:(IFISC) Artículos
Files in This Item:
File Description SizeFormat 
modeling_positive_Granger_Matias.pdf931,49 kBAdobe PDFThumbnail
View/Open
Show full item record
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.