EEG Normal EEG Waveforms 2

Question 1

What is the normal frequency range of the posterior dominant rhythm (alpha rhythm) in a healthy awake adult?

Accepted Answer

8-13 Hz

Answer

4-7 Hz

Answer

14-20 Hz

Answer

21-30 Hz

Question 2

Sleep spindles are a hallmark of which stage of sleep?

Accepted Answer

Stage N2 sleep

Answer

Stage N1 (drowsiness)

Answer

Stage N3 (deep slow wave sleep)

Answer

REM sleep

Question 3

Vertex sharp waves (V waves) during drowsiness are maximally recorded at which electrode position?

Accepted Answer

Cz

Answer

Fp1 and Fp2

Answer

O1 and O2

Answer

T3 and T4

Question 4

The lambda wave is a positive sharp transient that occurs in the occipital region during:

Accepted Answer

Active visual scanning of a complex image or environment

Answer

Eye closure in a dark room

Answer

Deep sleep stage N3

Answer

Hyperventilation

Question 5

K-complexes are characterized by which of the following features?

Accepted Answer

A biphasic wave with initial sharp negative component followed by a positive slow wave, maximal at the vertex during N2 sleep

Answer

Low-amplitude fast activity in temporal regions during REM sleep

Answer

Continuous monomorphic theta activity in frontal regions

Answer

Bilateral occipital alpha bursts during drowsiness

Question 6

Positive occipital sharp transients of sleep (POSTS) are a normal finding seen during which sleep state?

Accepted Answer

NREM light sleep (N1-N2)

Answer

Wakefulness with eyes open

Answer

Deep slow-wave sleep (N3)

Answer

REM sleep only