Phase space topography and the Lyapunov exponent of electrocorticograms in partial seizures

Brain Topography
L D IasemidisW J Williams

Abstract

Electrocorticograms (ECoG's) from 16 of 68 chronically implanted subdural electrodes, placed over the right temporal cortex in a patient with a right medial temporal focus, were analyzed using methods from nonlinear dynamics. A time series provides information about a large number of pertinent variables, which may be used to explore and characterize the system's dynamics. These variables and their evolution in time produce the phase portrait of the system. The phase spaces for each of 16 electrodes were constructed and from these the largest average Lyapunov exponents (L's), measures of chaoticity of the system (the larger the L, the more chaotic the system is), were estimated over time for every electrode before, in and after the epileptic seizure for three seizures of the same patient. The start of the seizure corresponds to a simultaneous drop in L values obtained at the electrodes nearest the focus. L values for the rest of the electrodes follow. The mean values of L for all electrodes in the postictal state are larger than the ones in the preictal state, denoting a more chaotic state postictally. The lowest values of L occur during the seizure but they are still positive denoting the presence of a chaotic attractor. Based ...Continue Reading

References

May 1, 1986·Proceedings of the National Academy of Sciences of the United States of America·A Babloyantz, A Destexhe
Mar 1, 1994·IEEE Transactions on Bio-medical Engineering·Z Y Lin, J D Chen

❮ Previous
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Citations

Jul 1, 1997·Brain Topography·J P PijnF H Lopes da Silva
Mar 1, 1997·Annals of Biomedical Engineering·C E D'AttellisR O Sirne
Jan 25, 2012·Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology·Hirokazu TakahashiKensuke Kawai
Aug 12, 2009·Journal of Biological Physics·Klaus Lehnertz
Nov 1, 1960·Electroencephalography and Clinical Neurophysiology·W FEINDEL, R SCHNEIDER
Nov 1, 1991·Electroencephalography and Clinical Neurophysiology·J P PijnF H Lopes da Silva
Aug 1, 1996·Electroencephalography and Clinical Neurophysiology·A D KrystalD Gassert
Mar 7, 1992·Lancet·E BullimoreG Alarcon
Jan 1, 1994·Epilepsy Research·L D IasemidisJ C Sackellares
Sep 1, 1994·Brain Research. Cognitive Brain Research·H T SchuppC Braun
Dec 26, 2003·Comptes rendus biologies·Henri Korn, Philippe Faure
Jun 18, 2005·Epilepsy Research·W ChaovalitwongseJ C Sackellares
Jul 10, 2004·Journal of Physiology, Paris·Michel Le Van QuyenJacques Martinerie
Sep 26, 1997·Electroencephalography and Clinical Neurophysiology·K Lehnertz, C E Elger
Nov 5, 2003·Experimental Neurology·Ivo DruryRobert Savit
Oct 7, 2003·Mathematical Biosciences·Dingzhou LiRobert Savit
Dec 24, 1997·Mathematical Biosciences·R ManucaR S Savit
Feb 13, 2001·Journal of Neuroscience Methods·O A RossoE Başar
Nov 11, 1999·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·K Lehnertz
Jun 5, 2003·Medical Hypotheses·Juergen FellChristian E Elger
Nov 25, 2003·Pediatric Neurology·Wim van DrongelenKurt E Hecox
Apr 16, 2003·Epilepsy Research·Florian MormannChristian E Elger
Feb 1, 1997·Electroencephalography and Clinical Neurophysiology·M C CasdagliJ C Sackellares
Feb 28, 1998·Neurophysiologie clinique = Clinical neurophysiology·M Rey, P Guillemant
Mar 3, 2001·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·P SbriccoliM Marchetti
Nov 26, 1999·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·M J van der HeydenJ DeGoede
Jul 10, 2003·Lancet Neurology·Brian Litt, Javier Echauz
Oct 29, 2005·Chaos·Mary Ann F HarrisonYing-Cheng Lai
Aug 31, 2001·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·M Le Van QuyenF J Varela
Aug 31, 2001·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·K LehnertzC E Elger
Aug 31, 2001·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·I OsorioM G Frei
Dec 5, 2006·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·J Chris SackellaresLeonidas D Iasemidis
Apr 7, 2007·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Hyong C LeeMichael H Kohrman
Oct 30, 2008·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Fabrice WendlingLotfi Senhadji
Sep 23, 2000·Epilepsia·C E ElgerK Lehnertz

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