deep stage of sleep is represented by delta waves.
which stage of sleep is represented by delta waves?
deep stage
Na
Na
delta waves, like all brain waves, can be detected by electroencephalography (eeg). delta waves were originally defined as having a frequency between 1-4 hz, although more recent classifications put the boundaries at between 0.5 and 2 hz. they are the slowest and highest amplitude classically described brainwaves, although recent studies have described slower (<0.1 hz) oscillations delta waves begin to appear in stage 3 sleep, but by stage 4 nearly all spectral activity is dominated by delta waves. stage 3 sleep is defined as having less than 50% delta wave activity, while stage 4 sleep has more than 50% delta wave activity. these stages have recently been combined and are now collectively referred to as stage n3 slow-wave sleep. during n3 sws, delta waves account for 20% or more of the eeg record during this stage. delta waves occur in all mammals, and potentially all animals as well.
delta wave