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Non-linear analysis of intracranial electroencephalogram recordings with approximate entropy and Lempel-Ziv complexity for epileptic seizure detection

Record type: Conference or Workshop Item (Paper)

Epileptic seizures are generated by an abnormal synchronization of neurons unforeseeable for the patients. In this study we analyzed invasive electroencephalogram (EEG) recordings in patients suffering from medically intractable focal epilepsy with two non-linear methods, Approximate Entropy (ApEn) and Lempel-Ziv (LZ) complexity. ApEn and LZ complexity quantify the regularity and complexity of a time series, respectively, and are well suited to the analysis of non-stationary biomedical signals of short length. Our results show an increase in ApEn and LZ complexity values during seizures at the focal electrodes. These changes could also be seen at some extra focal electrodes. After the seizure ends, the values of both non-linear metrics return to values lower than those before the seizure. Moreover, we quantified the changes in LZ complexity, showing the complexity increase during the seizure and its notable decrease after its end. Our results suggest that these techniques are useful to detect changes due to epileptic seizures in the EEG.

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Citation

Abásolo, Daniel, James, Christopher and Hornero, Roberto (2007) Non-linear analysis of intracranial electroencephalogram recordings with approximate entropy and Lempel-Ziv complexity for epileptic seizure detection At 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (IEEE EMBC 2007). 23 - 26 Aug 2007. , pp. 1953-1956.

More information

Published date: 24 August 2007
Venue - Dates: 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (IEEE EMBC 2007), 2007-08-23 - 2007-08-26
Keywords: nonlinear analysis, biomedical signal classification, nonlinear dynamics

Identifiers

Local EPrints ID: 49443
URI: http://eprints.soton.ac.uk/id/eprint/49443
PURE UUID: e326e7f4-ccb8-4e01-aeb5-98bf2222858f

Catalogue record

Date deposited: 04 Dec 2007
Last modified: 17 Jul 2017 14:56

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Contributors

Author: Daniel Abásolo
Author: Christopher James
Author: Roberto Hornero

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