Figure 4
From: Resection of high frequency oscillations predicts seizure outcome in the individual patient
Spectral analysis of FRandR events. We provide here two examples of FRandR events with bimodal (A) and unimodal (B) frequency spectrum, respectively. From top to bottom: the raw data, the signal filtered in the ripple band (80–250 Hz), the signal filtered in the FR band (250–500 Hz), the Stockwell time-frequency transform, the instantaneous power spectrum averaged over the duration of the FR. The duration of the FRandR is highlighted in red, the FR in bold. (A) A blob appears in the time-frequency domain at latency 135.53 s and central frequency 350 Hz in the FR spectral range. This explains the event in the FR band filtered signal. (B) A blob appears in the time-frequency domain at latency 68.25 s and central frequency 190 Hz in the ripple spectral range. Energy of the broad peak in the ripple band spreads to higher frequencies and appears as an event in the FR band filtered signal.
