Which frequency range defines delta waves?

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Multiple Choice

Which frequency range defines delta waves?

Explanation:
Delta waves are the slowest EEG rhythms and indicate deep, restorative sleep. They occur at about 0.5 to 4 Hz, with high amplitude, and tend to dominate during slow-wave sleep (N3). This makes the 0.5–4 Hz range the defining band for delta waves. The other ranges correspond to different brain states: 4–7 Hz is theta (drowsy/light sleep), 8–13 Hz is alpha (relaxed wakefulness), and above 13 Hz is beta (alert, active thinking).

Delta waves are the slowest EEG rhythms and indicate deep, restorative sleep. They occur at about 0.5 to 4 Hz, with high amplitude, and tend to dominate during slow-wave sleep (N3). This makes the 0.5–4 Hz range the defining band for delta waves. The other ranges correspond to different brain states: 4–7 Hz is theta (drowsy/light sleep), 8–13 Hz is alpha (relaxed wakefulness), and above 13 Hz is beta (alert, active thinking).

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