Figure 2
From: High-frequency oscillations in scalp EEG mirror seizure frequency in pediatric focal epilepsy
Noise level in scalp HFO recording for Patient 2. (a) In the linear amplitude spectral density above 100 Hz, the noise floor of the low-noise amplifier (LNA, black) was lower than that of the commercial device (CD, gray). The LNA is thus more sensitive to events of lower amplitude. This feature allows the LNA to detect a higher number of HFO in the ripple band (depicted in red in panels (b,c) as well as in the fast ripple (FR) band (depicted in red in panels (e,f) that went undetected in the CD recording (gray). (d,g) Overall ripple (d) and FR (g) rates were higher for LNA (black) than for CD (gray) over the affected hemisphere (p < 0.001 for HFO ripples, Wilcoxon matched-pairs signed rank test).
