RPSGT RPSGT Electroencephalography & Signal Interpretation

Question 1

According to AASM scoring rules, which EEG electrode derivations are used for adult sleep staging?

Accepted Answer

F4-M1, C4-M2, and O2-M1

Answer

AASM recommends three EEG derivations (F4-M1, C4-M2, O2-M1) with contralateral backup electrodes to capture activity from frontal, central, and occipital cortical regions.

Question 2

K-complexes are most prominently identified in which EEG derivation?

Accepted Answer

Frontal (F3/F4)

Answer

K-complexes are generated in the frontal cortex and are best visualized in frontal EEG derivations (F3/F4), though they are visible across channels.

Question 3

Alpha rhythm is defined as EEG activity in the frequency range of:

Accepted Answer

8–13 Hz

Answer

Alpha activity is defined as EEG oscillations between 8–13 Hz, predominantly seen in occipital derivations during relaxed wakefulness with eyes closed.

Question 4

Sleep spindles are generated primarily by which brain structure?

Accepted Answer

Thalamus

Answer

Sleep spindles are generated by thalamocortical circuits, with the thalamic reticular nucleus acting as the pacemaker for the 12–15 Hz oscillations.

Question 5

Which EEG waveform, when occupying ≥20% of a 30-second epoch, defines N3 (slow-wave) sleep?

Accepted Answer

Delta waves (0.5–2 Hz, >75 µV amplitude)

Answer

N3 sleep is scored when high-amplitude delta waves (>75 µV, 0.5–2 Hz) occupy ≥20% of the 30-second epoch, reflecting deep slow-wave sleep.

RPSGT Exam Practice Test

RPSGT Exam Practice Test

RPSGT RPSGT Electroencephalography & Signal Interpretation