Beta waves have a frequency range of 13-35 Hz and are observed during which state?

Beta waves have a frequency range of 13-35 Hz and are observed during which state?

• A. Deep sleep
• B. Relaxed, sleepy state
• C. Alert wakefulness
• D. Unconsciousness

Answer: (C)

Beta waves represent an alert, actively engaged brain. They are fast, low-amplitude patterns in the 13–35 Hz range that occur when you’re awake and processing information. This desynchronized activity reflects ongoing cortical processing such as concentration or problem-solving. By contrast, deep sleep shows slow, high-amplitude delta activity, a relaxed wakeful state with eyes closed tends to produce alpha waves, and unconsciousness often features slower or attenuated activity. Therefore, when beta waves predominate, the EEG indicates alert wakefulness.

Beta waves represent an alert, actively engaged brain. They are fast, low-amplitude patterns in the 13–35 Hz range that occur when you’re awake and processing information. This desynchronized activity reflects ongoing cortical processing such as concentration or problem-solving. By contrast, deep sleep shows slow, high-amplitude delta activity, a relaxed wakeful state with eyes closed tends to produce alpha waves, and unconsciousness often features slower or attenuated activity. Therefore, when beta waves predominate, the EEG indicates alert wakefulness.