Institut de Mathématiques de Marseille, UMR 7373


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3 septembre 2018: 2 événements


  • Agenda ERC IChaos

    Du 11 août 2018 au 14 septembre 2018 - A.BUFETOV

    Scientific collaboration

    Résumé : 1) with Alexey KLIMENKO and Andrey DYMOV at the Steklov Institute of Moscow
    2) with Pavel NIKITIN and Sergey BEREZIN at the Steklov Institute of St.Petersburg

    Lieu : Moscow & St-Petersburg - Russia

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  • Séminaire Statistique

    Lundi 3 septembre 2018 14:30-15:30 - Hernando OMBAO - King Abdullah University

    Spectral causality in multivariate signals : beyond linearity

    Résumé : There has been a strong interest in causality testing in brain signals. Most of the current methods are based on vector autoregressive models and the limitations include potential model misspecification and the ability to capture only linear associations. Our proposed approach will be to study causality via oscillatory activities (dependence between different frequency bands). Of prime interest here is the notion of ``spectral causality” which is broadly characterized as the extent to which an oscillatory activity in a population of neurons can predict various oscillatory activities in another region at a future time point. Using these oscillations, we will build a class of functional multivariate cross-frequency oscillatory models so that our method can capture potential non-linear dependence of the present and past oscillatory activity. The new framework will be illustrated to multichannel electroencephalograms (EEG) recorded in an auditory study with the goal of differentiating the causality structure between the healthy and schizophrenic groups and to study the impact of transcranial magnetic stimulation (TMS) on modifying or moderating causality between regions.

    JPEG - 4.3 ko
    Hernando OMBAO

    Lieu : FRUMAM - Aix-Marseille Université - Site St Charles
    3, place Victor Hugo - case 39
    13331 MARSEILLE Cedex 03

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