[Todos] HOY: Coloquio Extraordinario DF - Mario Chavez, 14hs, Aula Seminario, 2do piso, Pab. I

[Augusto Roncaglia]

COLOQUIO EXTRAORDINARIO DEL DEPARTAMENTO DE FÍSICA FCEYN - UBA


              En el Aula Seminario, 2do piso, Pab. I,

              VIERNES 14/12, 14hs:

              MARIO CHAVEZ

              Hôpital Pitié-Salpêtrière, Paris, France



*Detecting dynamic spatial correlation with generalized wavelet  coherence
and non-stationary surrogate data*

Time series measured from real-world systems are generally noisy,
complex and display statistical properties that evolve continuously
over time. Here, we present a method that combines wavelet analysis
and non-stationary surrogates to detect short-lived spatial coherent
patterns from multivariate time-series. In contrast with standard
methods, the surrogate data used here are realisations of a
non-stationary stochastic process, preserving both the amplitude and
time-frequency distributions of original data. We evaluate this
framework on synthetic and real-world time series, and we show that it
can provide useful insights into the time-resolved structure of
spatially extended systems.


Mario Chavez has a background in complex systems applied to
neurosciences (M.S. and Ph.D. degrees in France). After holding
different postdoctoral positions (France & Italy) in the field of
nonlinear physics and biomedical signal processing, he became a
researcher at Centre National de la Recherche Scientifique (CNRS). His
research activities concern new methodologies for characterising
functional connectivity of electrophysiological signals recorded at
multiple scales (LFP/MEG/EEG/SEEG/fMRI). He has developed a complex
network-based framework to quantify the functional interactions
between different neural structures involved in generation and
propagation of epileptic activities.
More information on the research group can be found at:
http://charpierlab.fr
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