scholarly journals Influence analysis for high-dimensional time series with an application to epileptic seizure onset zone detection

2013 ◽  
Vol 214 (1) ◽  
pp. 80-90 ◽  
Author(s):  
Christoph Flamm ◽  
Andreas Graef ◽  
Susanne Pirker ◽  
Christoph Baumgartner ◽  
Manfred Deistler
Keyword(s):  
Time Series ◽  
Epileptic Seizure ◽  
High Dimensional ◽  
Seizure Onset ◽  
Influence Analysis ◽  
Seizure Onset Zone

scholarly journals Influence of Time-Series Normalization, Number of Nodes, Connectivity and Graph Measure Selection on Seizure-Onset Zone Localization from Intracranial EEG

2018 ◽  
Vol 31 (5) ◽  
pp. 753-766 ◽  
Author(s):  
Pieter van Mierlo ◽  
Octavian Lie ◽  
Willeke Staljanssens ◽  
Ana Coito ◽  
Serge Vulliémoz
Keyword(s):  
Time Series ◽  
Seizure Onset ◽  
Intracranial Eeg ◽  
Seizure Onset Zone ◽  
Graph Measure

scholarly journals Epileptic seizure propagation from the second somatic sensory area to the fronto-medial region, by insular redistribution. A case report and a connectome description

2015 ◽  
Vol 23 (1) ◽  
pp. 61-67
Author(s):  
Attila Balogh ◽  
Péter Halász ◽  
Dániel Fabó ◽  
Lóránd Erőss
Keyword(s):  
Case Report ◽  
Epilepsy Surgery ◽  
Epileptic Seizure ◽  
Motor Area ◽  
Seizure Onset ◽  
3T Mri ◽  
Sensory Area ◽  
Seizure Onset Zone ◽  
Video Eeg

SUMMARY Introduction. The seizure propagation phenomenon by inducing remote symptoms brings several difficulties in finding the seizure onset and delineating the epileptic network which should be taken into consideration in epilepsy surgery. By demonstrating a difficult (MRI negative) epilepsy surgery case explored with invasive presurgical evaluation we highlight the importance to recognise the secondary sensory area and to explore the the parieto-opercular-insular-medial frontal network in certain cases. A further conclusion is the consideration of the redistributory role of the insula as a special structure in the cerebral connectome, having a role in epileptic network organisation. Aims. To support the role of the insula in the organisation of an opercular – medial frontal epileptic network and to confirm Penfield’s the “second somatic sensory leg area” by way of a case report. We try to give an up to date exploration of our patient’s remote epileptic seizures by way of a connectome. Methods. The epileptic disorder was studied with intensive video EEG monitoring and two times 3T MRI. Interictal FDG (fluorodeoxyglucose) PET was also undertaken. Beside the scalp EEG and computerized frequency analysis, the evaluation was performed by invasive EEG with 2 grids and 2 strips and an insular deep electrode in addition. Electrical cortical stimulation and cortical mapping were also undertaken. Results. The video-EEG study revealed the complex seizure semiology. The left sided global somatosesensory aura in the leg, followed supplementary motor area manifestations represented a remote seizure. The seizure onset zone and the symptomatogenic zone were localised by the invasive electrophysiology. With the insular deep electrode we succeeded to explore the propagation of ictal activity to the insula and later to frontal medial surface. The PET, the negative 3T MRI results and the postprocessing morphometry confirmed the lesional origin and localised the epileptogenic area to the second somato-sensory field where a dysgenesis was located. Conclusions. By preoperative invasive video-EEG evaluation, the second somato-sensory leg area was delineated as the seizure onset zone. The resection of this area by IIb type cortical dysgenesis, resulted in a complete relief of the seizures. The invasive video-EEG revealed the peculiar role of the insula in the propagation of the epileptic seizure from the second sensory leg area to the ipsilateral fronto-medial supplemetary motor area. Our results, confirm, that the insula has a relay or node function on the parietal opercular-fronto-medial epileptic network. The connectome of the insula is a further additive of the scale-free features of the remote epileptic networks.

scholarly journals SozRank: A new approach for localizing the epileptic seizure onset zone

2018 ◽  
Vol 14 (1) ◽  
pp. e1005953 ◽  
Author(s):  
Yonathan Murin ◽  
Jeremy Kim ◽  
Josef Parvizi ◽  
Andrea Goldsmith
Keyword(s):  
Epileptic Seizure ◽  
Seizure Onset ◽  
New Approach ◽  
Seizure Onset Zone

scholarly journals Assessment of the Utility of Ictal Magnetoencephalography in the Localization of the Epileptic Seizure Onset Zone

2018 ◽  
Vol 75 (10) ◽  
pp. 1264 ◽  
Author(s):  
Rafeed Alkawadri ◽  
Richard C. Burgess ◽  
Yosuke Kakisaka ◽  
John C. Mosher ◽  
Andreas V. Alexopoulos
Keyword(s):  
Epileptic Seizure ◽  
Seizure Onset ◽  
Seizure Onset Zone

scholarly journals Network dynamics of the brain and influence of the epileptic seizure onset zone

2014 ◽  
Vol 111 (49) ◽  
pp. E5321-E5330 ◽  
Author(s):  
Samuel P. Burns ◽  
Sabato Santaniello ◽  
Robert B. Yaffe ◽  
Christophe C. Jouny ◽  
Nathan E. Crone ◽  
...  
Keyword(s):  
Epileptic Seizure ◽  
Network Dynamics ◽  
Seizure Onset ◽  
Seizure Onset Zone ◽  
The Brain

scholarly journals Phase–Amplitude Coupling and Epileptogenic Zone Localization of Frontal Epilepsy Based on Intracranial EEG

2021 ◽  
Vol 12 ◽  
Author(s):  
Huijuan Ma ◽  
Zeyu Wang ◽  
Chunsheng Li ◽  
Jia Chen ◽  
Yuping Wang
Keyword(s):  
Epileptic Seizure ◽  
Receiver Operating Curve ◽  
Epileptic Focus ◽  
Epileptogenic Zone ◽  
Seizure Onset ◽  
Intracranial Eeg ◽  
Seizure Onset Zone ◽  
Phase Amplitude ◽  
Frontal Epilepsy

Objective: This study aimed to explore the characteristics of phase-amplitude coupling in patients with frontal epilepsy based on their electrocorticography data, in order to identify the localization of epileptic regions and further guide clinical resection surgery.Methods: We adopted the modulation index based on the Kullback-Leibler distance, phase-amplitude coupling co-modulogram, and time-varying phase-amplitude modulogram to explore the temporal-spatial patterns and characterization of PAC strength during the period from inter- seizure to post-seizure. Taking the resected area as the gold standard, the epileptogenic zone was located based on MI values of 7 different seizure periods, and the accuracy of localization was measured by the area under the receiver operating curve.Results: (1) The PAC in the inter- and pre-seizure periods was weak and paroxysmal, but strong PAC channels were confined more to the seizure-onset zone and resection region. PAC during the seizure period was intense and persistent, but gradually deviated from the seizure-onset zone. (2) The characteristics of coupling strength of the inter- and pre-seizure EEG can be used to accurately locate the epileptogenic zone, which is better than that in periods after the beginning of a seizure. (3) In an epileptic seizure, the preferred phases of coupling were usually in the rising branches at the pre- and early-seizure stages, while those in the middle- and terminal-seizure were usually in the falling branch. We thus speculate that the coupling occurred in the rising branch can promote the recruitment of abnormal discharge, while the coupling occurred in the falling branch can inhibit the abnormal discharge.Conclusion: The findings suggest that the phase-amplitude coupling during inter- and pre-seizure is a promising marker of epileptic focus location. The preferred phase of coupling changed regularly with the time of epileptic seizure, suggesting that the surge and suppression of abnormal discharges are related to different phases.

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