Eur. Phys. J. Special Topics 227, 921–932 (2018)
https://doi.org/10.1140/epjst/e2018-800019-1

Regular Article

Extreme events in epileptic EEG of rodents after ischemic stroke

¹ REC Artificial Intelligence Systems and Neurotechnologies, Yuri Gagarin State Technical University of Saratov, 410054 Saratov, Russia
² Center for Biomedical Technology, Technical University of Madrid, Campus Montegancedo, 28223 Pozuelo de Alarcon, Madrid, Spain
³ Institute of Physiology I, University of Münster, Robert-Koch-Str 27a, 48149, Münster, Germany
⁴ Biomedical Research Networking Center in Bioengineering Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
⁵ Faculty of Computer Science and Information Technology, Saratov State University, 410012 Saratov, Russia

^a e-mail: alexander.pisarchik@ctb.upm.es

Received: 13 February 2018
Published online: 19 October 2018

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.