Comput. Biol. Med. - Connectivity analysis of multichannel EEG signals using recurrence based phase synchronization technique.

Tópicos

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Resumo

Real world biological systems such as the human brain are inherently nonlinear and difficult to model. However, most of the previous studies have either employed linear models or parametric nonlinear models for investigating brain function. In this paper, a novel application of a nonlinear measure of phase synchronization based on recurrences, correlation between probabilities of recurrence (CPR), to study connectivity in the brain has been proposed. Being non-parametric, this method makes very few assumptions, making it suitable for investigating brain function in a data-driven way. CPR's utility with application to multichannel electroencephalographic (EEG) signals has been demonstrated. Brain connectivity obtained using thresholded CPR matrix of multichannel EEG signals showed clear differences in the number and pattern of connections in brain connectivity between (a) epileptic seizure and pre-seizure and (b) eyes open and eyes closed states. Corresponding brain headmaps provide meaningful insights about synchronization in the brain in those states. K-means clustering of connectivity parameters of CPR and linear correlation obtained from global epileptic seizure and pre-seizure showed significantly larger cluster centroid distances for CPR as opposed to linear correlation, thereby demonstrating the superior ability of CPR for discriminating seizure from pre-seizure. The headmap in the case of focal epilepsy clearly enables us to identify the focus of the epilepsy which provides certain diagnostic value.

Resumo Limpo

real world biolog system human brain inher nonlinear difficult model howev previous studi either employ linear model parametr nonlinear model investig brain function paper novel applic nonlinear measur phase synchron base recurr correl probabl recurr cpr studi connect brain propos nonparametr method make assumpt make suitabl investig brain function datadriven way cprs util applic multichannel electroencephalograph eeg signal demonstr brain connect obtain use threshold cpr matrix multichannel eeg signal show clear differ number pattern connect brain connect epilept seizur preseizur b eye open eye close state correspond brain headmap provid meaning insight synchron brain state kmean cluster connect paramet cpr linear correl obtain global epilept seizur preseizur show signific larger cluster centroid distanc cpr oppos linear correl therebi demonstr superior abil cpr discrimin seizur preseizur headmap case focal epilepsi clear enabl us identifi focus epilepsi provid certain diagnost valu

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