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Open AccessArticle

Differentiating Interictal and Ictal States in Childhood Absence Epilepsy through Permutation Rényi Entropy

IRCCS Centro Neurolesi Bonino-Pulejo, Via Palermo c/da Casazza, SS. 113, Messina, Italy
HypoSafe A/S, Diplomvej 381, 2800 Kgs. Lyngby, Denmark
Neurophysiology Center, Department of Neurology, Roskilde University Hospital, Koegevej 7-13, DK-4000 Roskilde, Denmark
DICEAM Department, Mediterranean University of Reggio Calabria, Via Graziella Feo di Vito, 89060 Reggio Calabria, Italy
Author to whom correspondence should be addressed.
Academic Editor: Wassim M. Haddad
Entropy 2015, 17(7), 4627-4643;
Received: 31 March 2015 / Revised: 18 June 2015 / Accepted: 25 June 2015 / Published: 2 July 2015
(This article belongs to the Special Issue Entropy in Human Brain Networks)
Permutation entropy (PE) has been widely exploited to measure the complexity of the electroencephalogram (EEG), especially when complexity is linked to diagnostic information embedded in the EEG. Recently, the authors proposed a spatial-temporal analysis of the EEG recordings of absence epilepsy patients based on PE. The goal here is to improve the ability of PE in discriminating interictal states from ictal states in absence seizure EEG. For this purpose, a parametrical definition of permutation entropy is introduced here in the field of epileptic EEG analysis: the permutation Rényi entropy (PEr). PEr has been extensively tested against PE by tuning the involved parameters (order, delay time and alpha). The achieved results demonstrate that PEr outperforms PE, as there is a statistically-significant, wider gap between the PEr levels during the interictal states and PEr levels observed in the ictal states compared to PE. PEr also outperformed PE as the input to a classifier aimed at discriminating interictal from ictal states. View Full-Text
Keywords: permutation entropy; electroencephalogram; Rényi’s entropy; absence seizures permutation entropy; electroencephalogram; Rényi’s entropy; absence seizures
MDPI and ACS Style

Mammone, N.; Duun-Henriksen, J.; Kjaer, T.W.; Morabito, F.C. Differentiating Interictal and Ictal States in Childhood Absence Epilepsy through Permutation Rényi Entropy. Entropy 2015, 17, 4627-4643.

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