EEG Beta Light Anaesthesia — FRCA Primary MCQ

Instant feedback + full explanation. One question, done properly.

HardPhysiology - NeurophysiologyEEG Beta Light AnaesthesiaFRCA Primary

Which EEG frequency band is most typically associated with alertness, anxiolysis and very light sedation?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: D — Beta activity at approximately 13–30 Hz

The best answer is “Beta activity at approximately 13–30 Hz”. Beta activity is relatively fast, low-amplitude activity associated with alertness, anxiety and very light sedation. Alpha activity is classically seen during relaxed wakefulness with closed eyes, theta with drowsiness and delta with deeper sleep or anaesthetic effect. Frequency bands overlap clinically, so the question asks for the best typical association.

Reference: Royal College of Anaesthetists, Primary FRCA Syllabus 2021: https://www.rcoa.ac.uk/sites/default/files/documents/2026-01/Primary-FRCA-Syllabus.pdf