Question

Normal EEG frequency range is ............

• A. 50 – 500 Hz
• B. 0.5 – 50 Hz
• C. 0.05 – 5 Hz
• D. 1 – 200 Hz

Hint:

\textbf{Tip:} Remember the basic EEG frequency range by associating it with human brain activity states—ranging from deep sleep (0.5 Hz) to active thinking (up to 50 Hz).

Answer 1

The Correct Option is B

Electroencephalography (EEG) is a technique used to record the electrical activity of the brain.
The normal EEG frequency range typically lies between 0.5 Hz to 50 Hz. This range includes several major frequency bands:
Delta (0.5–4 Hz), Theta (4–8 Hz), Alpha (8–13 Hz), Beta (13–30 Hz), and sometimes Gamma (30–50 Hz).
These frequencies correspond to different states of brain activity such as sleep, relaxation, and alertness.
Higher or lower frequencies outside this range are generally not used in clinical EEG recordings due to signal distortion or noise.