Which brain-wave pattern is typically present when awake and alert, with smaller and faster waves than alpha waves?

Which brain-wave pattern is typically present when awake and alert, with smaller and faster waves than alpha waves?

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

Answer: (B)

Awake and alert brain activity is reflected in beta waves. Beta waves are higher in frequency and lower in amplitude than alpha waves, typically running about 12–30 Hz, and they appear when you’re actively thinking, concentrating, or paying attention to something. This contrasts with alpha waves, which show up during relaxed wakefulness with eyes closed and are slower, around 8–12 Hz. Theta waves are slower still and link to drowsiness or light sleep (roughly 4–7 Hz), while delta waves dominate deep sleep (below 4 Hz). So, when you’re awake and focused, beta activity is the prevailing pattern.

Awake and alert brain activity is reflected in beta waves. Beta waves are higher in frequency and lower in amplitude than alpha waves, typically running about 12–30 Hz, and they appear when you’re actively thinking, concentrating, or paying attention to something. This contrasts with alpha waves, which show up during relaxed wakefulness with eyes closed and are slower, around 8–12 Hz. Theta waves are slower still and link to drowsiness or light sleep (roughly 4–7 Hz), while delta waves dominate deep sleep (below 4 Hz). So, when you’re awake and focused, beta activity is the prevailing pattern.