High-frequency oscillations (HFOs) refer to transient brain wave patterns that occur at frequencies greater than 80 Hz and can be observed in various types of neurophysiological recordings, such as electroencephalograms (EEGs) and intracranial electroencephalograms (iEEGs). HFOs are often classified into two main categories based on their frequency range: 1. **Fast ripples**: Typically defined as oscillations between 250 to 500 Hz.
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