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Proceedings Paper

Innovation-based sparse estimation of functional connectivity from multivariate autoregressive models
Author(s): François Deloche; Fabrizio De Vico Fallani; Stéphanie Alassoniѐre
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Paper Abstract

One of the main limitations of functional connectivity estimators of brain networks is that they can suffer from statistical reliability when the number of areas is large and the available time series are short. To estimate directed functional connectivity with multivariate autoregressive (MVAR) model on sparse connectivity assumption, we propose a modified Group Lasso procedure with an adapted penalty. Our procedure includes the innovation estimates as explaining variables. This approach is inspired by two criteria that are used to interpret the coefficients of the MVAR model, the Directed Transfer Function (DTF) and the Partial Directed Coherence (PDC). A causality measure can be deduced from the output coefficients which can be understood as a synthesis of PDC and DTF. We demonstrate the potential of our method and compare our results with the standard Group Lasso on simulated data.

Paper Details

Date Published: 24 August 2015
PDF: 11 pages
Proc. SPIE 9597, Wavelets and Sparsity XVI, 95971I (24 August 2015); doi: 10.1117/12.2189640
Show Author Affiliations
François Deloche, École Polytechnique, CNRS (France)
Fabrizio De Vico Fallani, INRIA (France)
Institut du Cerveau et de la Moelle épinière (France)
Stéphanie Alassoniѐre, École Polytechnique, CNRS (France)

Published in SPIE Proceedings Vol. 9597:
Wavelets and Sparsity XVI
Manos Papadakis; Vivek K. Goyal; Dimitri Van De Ville, Editor(s)

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