Quiz 04: Brain waves: delta, theta, alpha, beta, gamma

8 questions on lesson 4. Nothing is timed. Pick one answer for each, then check them.

1. What is the usual frequency range of the alpha band? 13 to 30 Hz 4 to 8 Hz 8 to 13 Hz 0.5 to 4 Hz

2. When is alpha strongest in a healthy adult? Relaxed and awake with eyes closed, at the back of the head In deep sleep, at the front of the head Only during a seizure While solving a hard problem with eyes open

3. In adults, when is delta activity normal? When awake and alert In deep sleep (stage N3) When the eyes are open During focused tasks

4. Which band is usually the biggest in size (amplitude)? Delta Alpha Beta Gamma

5. Why should you be careful with gamma activity in scalp EEG? It is easily confused with muscle noise It is always a sign of disease It is too slow to measure It only appears in babies

6. Sedatives such as benzodiazepines commonly cause… Much more beta activity Sleep spindles while awake No alpha at all Much more delta while awake

7. What is a sleep spindle? A burst of 11–16 Hz waves lasting at least 0.5 s, a sign of N2 sleep A large wave at the front of the head when you wake up Muscle noise during sleep The alpha rhythm during dreams

8. The mu rhythm fades when you… Move, or imagine moving, the opposite hand Fall asleep Close your eyes Hear a loud sound

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