Inter-Site Eeg Relationships before Widespread Epileptiform Discharges
- 1 January 1995
- journal article
- Published by Taylor & Francis in International Journal of Neuroscience
- Vol. 82 (1-2) , 143-153
- https://doi.org/10.3109/00207459508994298
Abstract
EEG interactions of the background among locations can start to change just before epileptiform discharges. Such interactions were investigated with relative power contribution analysis based on a multivariate autoregressive model, which permits determination of multiple causal relations of EEGs among locations. EEGs from F3, F4, P3, P4, T3 and T4 were examined in 10 epileptic patients with asymmetric spike and wave complexes (SWCs). A 12.5-s epoch just before SWCs was divided into stationary segments throughout 6 locations with a segmentation method. In segments long before SWCs, most power at each location was generated from its own location. In segments immediately preceding SWCs, contributions from other locations, particularly from the hemisphere with smaller SWCs, increased. Overall EEG relationships among 6 locations were examined by an entropy which measures the uniformness of the spatial distribution of power contribution. The entropy significantly increased gradually toward SWCs. Our findings demonstrated stronger interactions among locations just before epileptiform discharges, suggesting a transitional state from background EEG to epileptiform discharges.Keywords
This publication has 25 references indexed in Scilit:
- Regional coherence and the transfer of ictal activity during seizure onset in the medial temporal lobeElectroencephalography and Clinical Neurophysiology, 1992
- EEG coherence as a predictor of spike propagationElectroencephalography and Clinical Neurophysiology, 1992
- On the tracking of rapid dynamic changes in seizure EEGIEEE Transactions on Biomedical Engineering, 1992
- Propagation of human complex-partial seizures: a correlation analysisElectroencephalography and Clinical Neurophysiology, 1991
- The Hans Berger lecture Functional explorations of the human epileptic brain and their therapeutic implicationsElectroencephalography and Clinical Neurophysiology, 1990
- Interhemispheric interactions in seizures of focal onset: data from human intracranial recordingsElectroencephalography and Clinical Neurophysiology, 1987
- Methods of Analysis of Nonstationary EEGs, with Emphasis on Segmentation TechniquesJournal Of Clinical Neurophysiology, 1985
- Computerized EEG pattern classification by adaptive segmentation and probability density function classification. Clinical evaluationElectroencephalography and Clinical Neurophysiology, 1985
- A new look at the statistical model identificationIEEE Transactions on Automatic Control, 1974
- Theoretical StatisticsPublished by Springer Nature ,1974