AP PSYCHOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -EEG delta waves are high-amplitude brain waves and are associated with deep sleep stages.

Detailed explanation-3: -A delta wave is a type of high amplitude brain wave found in humans that is associated with deep sleep. Delta waves have a frequency from one to three hertz (Hz) and are measured using an electroencephalogram (EEG). 1.

Detailed explanation-4: -Delta waves are slow EEG waves that oscillate from about . 5 to 4 times per second. Delta waves tend to be large in amplitude. Delta waves are rarely seen in the healthy waking adult EEG but are prominent and normal during sleep, especially of infants, children, and young adults.

Detailed explanation-5: -Deep, slow brain waves known as delta waves begin to emerge during NREM stage 3 sleep-a stage that is also referred to as delta sleep. This is a period of deep sleep where any noises or activity in the environment may fail to wake the sleeping person.