Which EEG pattern is characteristically associated with active wakefulness and mental concentration, having a frequency of 14–30 Hz?

• A Alpha rhythm (8–13 Hz)
• B Beta rhythm (14–30 Hz) ✓
• C Theta rhythm (4–8 Hz)
• D Delta rhythm (0.5–4 Hz)

Explanation

Beta rhythms (14–30 Hz, low amplitude) are the dominant EEG pattern during active mental activity, problem solving, anxiety, and focused alertness. Alpha waves (8–13 Hz) appear in the relaxed awake state with eyes closed, predominantly over the occipital cortex, and are blocked by eye opening or mental activity. Theta waves occur during drowsiness and light sleep; delta waves characterize deep sleep.

Reference: Guyton & Hall, Textbook of Medical Physiology, 14th ed.

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Written and medically reviewed by the StethoPrep medical team.