Extreme events in epileptic EEG of rodents after ischemic stroke

Abstract Extreme events are observed on electroencephalographic (EEG) recordings of rodents with induced ischemic stroke. These events represent themselves as post-stroke epileptic seizures in the form of spontaneous high-amplitude oscillations, which appear during the first 2–3 h after induced focal cerebral ischemia. The analysis of the EEG time-frequency structure reveals these extreme events as a sharp sudden growth of the wavelet energy in a particular frequency band, while the energy in the resting part of the power spectrum remains normal. The distinguished features of the extreme events are used for detection and quantification of the pathological brain activity.

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