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Event synchronization: A simple and fast method to measure synchronicity and time delay patterns

Quian Quiroga, Rodrigo and Kreuz, T. and Grassberger, P. (2002) Event synchronization: A simple and fast method to measure synchronicity and time delay patterns. Physical Review E, 66 (4). 041904-1. ISSN 1539-3755.

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We propose a simple method to measure synchronization and time-delay patterns between signals. It is based on the relative timings of events in the time series, defined, e.g., as local maxima. The degree of synchronization is obtained from the number of quasisimultaneous appearances of events, and the delay is calculated from the precedence of events in one signal with respect to the other. Moreover, we can easily visualize the time evolution of the delay and synchronization level with an excellent resolution. We apply the algorithm to short rat electroencephalogram (EEG) signals, some of them containing spikes. We also apply it to an intracranial human EEG recording containing an epileptic seizure, and we propose that the method might be useful for the detection of epileptic foci. It can be easily extended to other types of data and it is very simple and fast, thus being suitable for on-line implementations.

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Additional Information:© 2002 The American Physical Society. Received 28 February 2002; published 15 October 2002. We are very thankful to Ralph Andrzejak, Alexander Kraskov, Klaus Lehnertz, and Heinz Schuster for stimulating discussions, to Giles van Luijtelaar and Joyce Welting from NICI, University of Nijmegen, for the rats data used in this paper and to K. Lehnertz and C. Elger from the Department of Epileptology, University of Bonn, for the intracranial EEG data. T.K. was supported by the Deutsche Forschungsgemeinschaft, Grant No. SFB TR3.
Group:Koch Laboratory (KLAB)
Funding AgencyGrant Number
Deutsche ForschungsgemeinschaftSFB TR3
Issue or Number:4
Classification Code: PACS: 87.90.+y, 05.45.Tp, 05.45.Xt, 87.19.Nn
Record Number:CaltechAUTHORS:20130816-103221435
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:40495
Deposited By: KLAB Import
Deposited On:26 Jan 2008 04:23
Last Modified:03 Oct 2019 05:13

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