What does the EEG record for stage 4 sleep look like (compared to other stages of sleep)?

Question

Quizplus · Accepted Answer

Stage 4 sleep is characterized by the presence of delta waves, which are long, slow waves with a frequency of around 1-4 Hz. The EEG during this stage will show a predominance of these delta waves, which are quite different from the higher frequency and shorter alpha and beta waves associated with wakefulness and other stages of sleep.

What Does the EEG Record for Stage 4 Sleep Look