Alpha wave activity is seen simultaneously with delta wave
The decrease in delta waves
observed while teens sleep could be caused by a reduction in the size of groups of brain cells that "talk" to one another.
Individuals with WPW syndrome in whom the delta waves
disappear with increases in the heart rate are considered at lower risk of SCD.
Stage Description Duration W Wakefulness ~16 hours N1 Somnolence; "drowsy," easily awakened 1-5% N2 Asleep -50% N3 Slow Wave Sleep ~7% (SWS) Transition to deep sleep N4 Slow Wave Sleep ~20-25% (SWS) Deep sleep REM1-4 Rapid Eye Movement ~20-25% Stage EEG Brainwave pattern Events and abnormalities W Alpha waves Daytime consciousness N1 Theta waves Hypnogogic twitches, hallucinations N2 Slower waves, sleep spindles, K-complexes Unconsciousness N3 <50% delta waves
Melatonin peak, (SWS) night terrors, parasomnias N4 >50% delta waves
Minimum core temperature, (SWS) rebounds after deprivation REM1-4 Rapid low-voltage EEG Dreaming, low muscle tone, rebounds after deprivation
Electrical brain activity during the concentration stress test was significantly increased for both theta and delta waves
in the Neuravena group, researchers noted.
The researchers calculated the power ratio of alpha waves to theta waves (A/T); the ratio of alpha waves to delta waves
(A/D); and the ratio of alpha waves to the sum of theta and delta waves
The brain begins to produce delta waves
, a type of wave that is large (high amplitude) and slow (low frequency).
Electroencephalograph (EEG) demonstrated intermittent irregular slow delta waves
in the right frontal and left temporal regions but no biphasic or triphasic waves.
The increased slow-wave activity consists of alpha, theta and delta waves
Melatonin, delta waves
, and cooling caps sidestep what Naiman calls the most common sleep-wrecker: 21st-century hyperarousal.
She goes on to explain how a high number of delta waves
in our brains can make behaving strangely just a coping mechanism for focusing.