Observation / alpha band / 8–12 Hz
The trace changes before the alarm.
Relative alpha power declines across the final six minutes before event capture.
window
−06:00 → 00:00
change
−33 pts
Relative band power / alpha 8–12 Hz
delta <4
theta 4–7
alpha 8–12
beta 13–30
gamma >32
alpha / conventionally plotted in red
electrode pairs aligned to fixed baseline pitch