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Type III intermittency in human partial epilepsy
Author(s) -
Velazquez J. L. Perez,
Khosravani Houman,
Lozano Andres,
Bardakjian Berj. L.,
Carlen Peter L.,
Wennberg Richard
Publication year - 1999
Publication title -
european journal of neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.346
H-Index - 206
eISSN - 1460-9568
pISSN - 0953-816X
DOI - 10.1046/j.1460-9568.1999.00688.x
Subject(s) - ictal , intermittency , epilepsy , partial epilepsy , neuroscience , complex partial seizures , electroencephalography , psychology , steady state (chemistry) , transient (computer programming) , physics , computer science , chemistry , temporal lobe , turbulence , thermodynamics , operating system
Abstract A rigorous characterization of the dynamic regimes underlying human seizures is needed to understand, and possibly control, the transition to seizure. Intra‐ or extracranial brain electrical activity was recorded in five patients with partial epilepsy, and the interictal and ictal activity analysed to determine the dynamics of seizures. We constructed first‐return one‐dimensional maps by fitting the scatter plots of interpeak intervals. The features of the mapping indicated that type III intermittency is the dynamic charateristic of the ictal events. This was confirmed using histograms of the durations of the regular phases during seizures. The intermittent regime explains the abrupt transitions observed during ictal events in terms of transient stabilization of the unstable steady state.