Which EEG waveforms are in the correct order from the highest to the lowest frequency?

Which EEG waveforms are in the correct order from the highest to the lowest frequency?

• A. Beta, Alpha, Theta, Delta
• B. Beta, Delta, Theta, Alpha
• C. Beta, Theta, Delta, Alpha
• D. Delta, Theta, Alpha, Beta

Answer: (A)

The main idea is ranking EEG wave frequencies from highest to lowest, which corresponds to levels of brain arousal. Beta waves are the fastest (about 13–30 Hz) and appear during active thinking and wakefulness. Next come Alpha waves (about 8–13 Hz) during relaxed wakefulness. Then Theta waves (about 4–7 Hz) appear in drowsiness and light sleep, and finally Delta waves (about 0.5–4 Hz) are the slowest, dominating deep sleep. So the correct sequence from highest to lowest frequency is Beta, Alpha, Theta, Delta. The other options mix these frequencies in a way that doesn’t follow the descending order (for example, placing Delta before higher-frequency waves or reversing the relative speeds), which wouldn’t match how EEG frequencies line up with arousal states.

The main idea is ranking EEG wave frequencies from highest to lowest, which corresponds to levels of brain arousal. Beta waves are the fastest (about 13–30 Hz) and appear during active thinking and wakefulness. Next come Alpha waves (about 8–13 Hz) during relaxed wakefulness. Then Theta waves (about 4–7 Hz) appear in drowsiness and light sleep, and finally Delta waves (about 0.5–4 Hz) are the slowest, dominating deep sleep.

So the correct sequence from highest to lowest frequency is Beta, Alpha, Theta, Delta. The other options mix these frequencies in a way that doesn’t follow the descending order (for example, placing Delta before higher-frequency waves or reversing the relative speeds), which wouldn’t match how EEG frequencies line up with arousal states.