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. 2017 Jan 30;8:14. doi: 10.3389/fneur.2017.00014

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Copyright © 2017 Tamilia, Madsen, Grant, Pearl and Papadelis.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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High-frequency oscillations (HFOs) vs. artifactual oscillations recorded with scalp electroencephalography (EEG) data from a patient with focal epilepsy. (A) Raw EEG with interictal epileptic spikes (gray section). (B) EEG filtered with high-pass filter of 80 Hz. Gray section in (A) is expanded in time and amplitude in (B). Ripple HFOs are underlined. The morphology of HFOs is more rhythmic and regular in amplitude and frequency than artifactual oscillations. Source: adapted from Andrade-Valenca et al. (110).