Question

Normal EEG frequency range is ___ .

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

Hint:

EEG Frequency Bands. Delta (%lt; 4Hz), Theta (4-8Hz), Alpha (8-13Hz), Beta (13-30Hz), Gamma (>30Hz). The overall range of interest is commonly considered up to ~50Hz or slightly higher.

Answer 1

The Correct Option is B

Electroencephalography (EEG) records the electrical activity of the brain using electrodes placed on the scalp
The resulting waveforms contain various frequency components associated with different brain states
The major frequency bands typically analyzed in clinical EEG are: - Delta (\(\delta\)):<4 Hz (Deep sleep) - Theta (\(\theta\)): 4 -<8 Hz (Drowsiness, light sleep, meditation) - Alpha (\(\alpha\)): 8 - 13 Hz (Relaxed wakefulness, eyes closed) - Beta (\(\beta\)):>13 Hz (often 13-30 Hz) (Alert wakefulness, active thinking) - Gamma (\(\gamma\)):>30 Hz (sometimes up to 100 Hz or more) (Cognitive processing) The clinically relevant frequencies generally fall within the range from below 1 Hz (e
g
, 0
5 Hz) up to around 50-70 Hz, although higher frequencies exist
Option (2) 0
5-50Hz best represents the typical range encompassing the major EEG bands studied