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MESURE DE COUPLAGE STATISTIQUE ENTRE SIGNAUX EEG : APPLICATION A L'EVALUATION QUANTITATIVE DES RELATIONS FONCTIONNELLES ENTRE STRUCTURES CEREBRALES EN EPILEPSIE : MESURE DE COUPLAGE STATISTIQUE ENTRE SIGNAUX EEG : APPLICATION A L'EVALUATION QUANTITATIVE DES RELATIONS FONCTIONNELLES ENTRE STRUCTURES CEREBRALES EN EPILEPSIE

Abstract : Cerebral functional connectivity can be characterized by the temporal evolution of the correlation between signals recorded in spatially distributed brain areas. In this thesis, we propose a comprehensive and quantitative comparison for evaluating the performances of various classes of methods aimed at estimating this connectivity. Based on various simulation models, results show that the performances are strongly dependent on the characteristics of signals, i.e. none of the methods outperforms the others in all situations. Considering the non-stationary and oscillatory nature of the activity of neuronal populations, we propose a time-frequency (TF) estimator of the relationship for non-stationary signals. The objective comparison of this new estimator with a more classical one, based on the coherence function, shows that it can lead to better performances. On real data, results indicate that this estimator can also increase the readability of the TF representation of the relationship and can thus improve the interpretation of the interdependences between EEG signals.
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https://tel.archives-ouvertes.fr/tel-00130596
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Submitted on : Monday, February 12, 2007 - 8:18:48 PM
Last modification on : Thursday, January 14, 2021 - 11:24:59 AM
Long-term archiving on: : Friday, November 25, 2016 - 3:01:58 PM

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  • HAL Id : tel-00130596, version 1

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Karim Ansari-Asl. MESURE DE COUPLAGE STATISTIQUE ENTRE SIGNAUX EEG : APPLICATION A L'EVALUATION QUANTITATIVE DES RELATIONS FONCTIONNELLES ENTRE STRUCTURES CEREBRALES EN EPILEPSIE : MESURE DE COUPLAGE STATISTIQUE ENTRE SIGNAUX EEG : APPLICATION A L'EVALUATION QUANTITATIVE DES RELATIONS FONCTIONNELLES ENTRE STRUCTURES CEREBRALES EN EPILEPSIE. Traitement du signal et de l'image [eess.SP]. Université Rennes 1, 2005. Français. ⟨tel-00130596⟩

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