AP PSYCHOLOGY

Detailed explanation-1: -The slow delta waves only occur during the deepest stage of sleep, and as such are predominant in stage N3. Delta brain waves are the slowest brain waves, measuring at 0.5 to 3 Hertz. When delta brain waves are most dominant, your brain is involved in resting and regeneration.

Detailed explanation-2: -Stage 3 sleep is also known as N3 or deep sleep, and it is harder to wake someone up if they are in this phase. Muscle tone, pulse, and breathing rate decrease in N3 sleep as the body relaxes even further. The brain activity during this period has an identifiable pattern of what are known as delta waves.

Detailed explanation-3: -Stage 3 is often referred to as deep sleep or slow-wave sleep because this stage is characterized by low frequency (less than 3 Hz), high amplitude delta waves (Figure SC. 10). During this time, an individual’s heart rate and respiration slow dramatically.

Detailed explanation-4: -In the deepest level of sleep, stage IV sleep, the predominant EEG activity consists of low frequency (1–4 Hz), high-amplitude fluctuations called delta waves, the characteristic slow waves for which this phase of sleep is named. The entire sequence from drowsiness to deep stage IV sleep usually takes about an hour.

Detailed explanation-5: -Stage 2 sleep is characterized by the appearance of both sleep spindles and K-complexes. Stage 3 of sleep is often referred to as deep sleep or slow-wave sleep because these stages are characterized by low frequency (less than 3 Hz), high amplitude delta waves (Figure 4).