Brain source localization using a physics-driven structured cosparse representation of EEG signals

Laurent Albera (1, 2) , Srđan Kitić (2) , Nancy Bertin (2) , Gilles Puy (2) , Rémi Gribonval (2)

1 LTSI - Laboratoire Traitement du Signal et de l'Image
2 PANAMA - Parcimonie et Nouveaux Algorithmes pour le Signal et la Modélisation Audio

Localizing several potentially synchronous brain activities with low signal-to-noise ratio from ElectroEncephaloGraphic (EEG) recordings is a challenging problem. In this paper we propose a novel source localization method, named CoRE, which uses a Cosparse Representation of EEG signals. The underlying analysis operator is derived from physical laws satisfied by EEG signals, and more particularly from Poisson's equation. In addition, we show how physiological constraints on sources, leading to a given space support and fixed orientations for current dipoles, can be taken into account in the optimization scheme. Computer results, aiming at showing the feasability of the CoRE technique, illustrate its superiority in terms of estimation accuracy over dictionary-based sparse methods and subspace approaches.

Mots clés: synchronous current activities; Brain source localization; EEG; cosparsity; synchronous current activities.

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]; Ingénierie biomédicale

Laurent Albera, Srđan Kitić, Nancy Bertin, Gilles Puy, Rémi Gribonval. Brain source localization using a physics-driven structured cosparse representation of EEG signals. 2014 IEEE International Workshop on Machine Learning for Signal Processing, Sep 2014, Reims, France. 6 p., ⟨10.1109/MLSP.2014.6958871⟩. ⟨hal-01027609⟩