What it looks like
Low-amplitude fast activity is normal over frontocentral regions. Abundant, higher-amplitude, widespread beta is most often a medication effect, classically benzodiazepines and barbiturates. 11
What it means at the bedside
Read it as a clue to sedatives, not as disease. The useful abnormality is the opposite one: focal loss of beta points to cortical injury or a fluid collection under that region.