Analysis of the Phase Locking Index for Measuring of Interdependency of Cortical Signals Recorded in the EEG

A. Sazonov, Chin Keong Ho, J.W.M. Bergmans, J.B.A.M. Arends, P.A.M. Griep, E.A. Verbitskiy, P.J.M. Cluitmans, P.A.J.M. Boon

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Abstract

The phase locking index (PLI) was introduced to quantify in a statistical sense the phase synchronization of two signals. It has been commonly used to process biosignals. In this paper, we analyze the PLI for measuring the interdependency of cortical source signals (CSSs) recorded in the Electroencephalogram (EEG). The main focus of the analysis is the probability density function, which describes the sensitivity of the PLI to the joint noise ensemble in the CSSs. Since this function is mathematically intractable, we derive approximations and analyze them for a simple analytical model of the CSS mixture in the EEG. The accuracies of the approximate probability density functions (APDFs) are evaluated using simulations for the model. The APDFs are found sufficiently accurate and thus are applicable for practical intents and purposes. They can hence be used to determine the confidence intervals and significance levels for detection methods for interdependencies, e.g., between cortical signals recorded in the EEG
Original languageEnglish
Title of host publicationProceedings of the 29th Annual International Conference of the IEEE-EMBS, 23-26 August 2007, Lyon, France
Place of PublicationLyon
PublisherInstitute of Electrical and Electronics Engineers
Pages1985-1991
Publication statusPublished - 2007
Eventconference; The 29th Annual International Conference of the IEEE EMBS (EMBC); Lyon; FR; 2007-08-23; 2007-08-26 -
Duration: 23 Aug 200726 Aug 2007

Conference

Conferenceconference; The 29th Annual International Conference of the IEEE EMBS (EMBC); Lyon; FR; 2007-08-23; 2007-08-26
Period23/08/0726/08/07
OtherThe 29th Annual International Conference of the IEEE EMBS (EMBC); Lyon; FR

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    Sazonov, A., Ho, C. K., Bergmans, J. W. M., Arends, J. B. A. M., Griep, P. A. M., Verbitskiy, E. A., ... Boon, P. A. J. M. (2007). Analysis of the Phase Locking Index for Measuring of Interdependency of Cortical Signals Recorded in the EEG. In Proceedings of the 29th Annual International Conference of the IEEE-EMBS, 23-26 August 2007, Lyon, France (pp. 1985-1991). Lyon: Institute of Electrical and Electronics Engineers.