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We consider the basal and preictal phases and meticulously analyze the dynamics across frequency bands, focusing on high-frequency oscillations up to 240 Hz. Our results reveal significant periodicities and critical time scales within neural dynamics across frequency bands. By bandpass filtering neural signals into delta, theta, alpha, beta, gamma, and ripple high-frequency bands (HFO), each associated with specific neural processes, we examine the distinct nonlinear dynamics. Our method introduces a reliable approach to pinpoint intrinsic time lag scales \u03c4 within frequency bands of the basal and preictal signals, which are crucial for the study of refractory epilepsy. Using metrics such as permutation entropy (H), Fisher information (F), and complexity (C), we explore nonlinear patterns within iEEG signals. We reveal the intrinsic \u03c4max that maximize complexity within each frequency band, unveiling the nonlinear subtle patterns of the temporal structures within the basal and preictal signal. Examining the H\u00d7F and C\u00d7F values allows us to identify differences in the delta band and a band between 200 and 220 Hz (HFO 6) when comparing basal and preictal signals. Differences in Fisher information in the delta and HFO 6 bands before seizures highlight their role in capturing important system dynamics. This offers new perspectives on the intricate relationship between delta oscillations and HFO waves in patients with focal epilepsy, highlighting the importance of these patterns and their potential as biomarkers.<\/jats:p>","DOI":"10.1063\/5.0201354","type":"journal-article","created":{"date-parts":[[2024,5,7]],"date-time":"2024-05-07T22:05:13Z","timestamp":1715119513000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["A multiscale symbolic approach to decoding delta and ripple oscillation bands as biomarkers for epileptiform discharges"],"prefix":"10.1063","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9553-4042","authenticated-orcid":false,"given":"Mauro","family":"Granado","sequence":"first","affiliation":[{"name":"Instituto de F\u00edsica de La Plata (IFLP), Universidad Nacional de La Plata, CONICET CCT-La Plata 1 , Diagonal 113 entre 63 y 64, La Plata 1900, Buenos Aires, Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0777-9283","authenticated-orcid":false,"given":"Santiago","family":"Collavini","sequence":"additional","affiliation":[{"name":"Unidad Ejecutora de Estudios en Neurociencias y Sistemas Complejos (EnyS), Hosp. \u201cEl Cruce-N. Kirchner,\u201d Universidad Nacional Arturo Jauretche, CONICET CCT-La Plata 2 , Av. Calchaqu\u00ed 5401, Florencio Varela 1888, Buenos Aires, Argentina"},{"name":"Instituto de Ingenier\u00eda y Agronom\u00eda, Universidad Nacional Arturo Jauretche, CONICET CCT-La Plata 3 , Av. 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