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A novel extended Granger Causal model approach demonstrates brain hemispheric differences during face recognition learning

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Ge, Tian, Kendrick, Keith M. and Feng, Jianfeng. (2009) A novel extended Granger Causal model approach demonstrates brain hemispheric differences during face recognition learning. PL o S Computational Biology, Vol.5 (No.11). ISSN 1553-734X

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Official URL: http://dx.doi.org/10.1371/journal.pcbi.1000570

Abstract

Two main approaches in exploring causal relationships in biological systems using time-series data are the application of Dynamic Causal model (DCM) and Granger Causal model (GCM). These have been extensively applied to brain imaging data and are also readily applicable to a wide range of temporal changes involving genes, proteins or metabolic pathways. However, these two approaches have always been considered to be radically different from each other and therefore used independently. Here we present a novel approach which is an extension of Granger Causal model and also shares the features of the bilinear approximation of Dynamic Causal model. We have first tested the efficacy of the extended GCM by applying it extensively in toy models in both time and frequency domains and then applied it to local field potential recording data collected from in vivo multi-electrode array experiments. We demonstrate face discrimination learninginduced changes in inter- and intra-hemispheric connectivity and in the hemispheric predominance of theta and gamma frequency oscillations in sheep inferotemporal cortex. The results provide the first evidence for connectivity changes between and within left and right inferotemporal cortexes as a result of face recognition learning.

Item Type: Journal Article
Subjects: Q Science > QA Mathematics
Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science > Centre for Scientific Computing
Faculty of Science > Computer Science
Library of Congress Subject Headings (LCSH): Biology -- Data processing, Biological systems, Time-series analysis, Cerebral hemispheres, Face perception
Journal or Publication Title: PL o S Computational Biology
Publisher: Public Library of Science
ISSN: 1553-734X
Date: 20 November 2009
Volume: Vol.5
Number: No.11
Number of Pages: 13
Identification Number: 10.1371/journal.pcbi.1000570
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Funder: Engineering and Physical Sciences Research Council (EPSRC), Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC), European Union (EU)
Grant number: CARMAN (EPSRC), CARMAN (EU)
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URI: http://wrap.warwick.ac.uk/id/eprint/2336

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