EEG Artifact Identification 2

Question 1

Which artifact appears as a regular, rhythmic waveform at the same frequency as the patient's heart rate?

Accepted Answer

Pulse artifact (ECG artifact)

Answer

Eye blink artifact

Answer

Electrode pop

Answer

Glossokinetic artifact

Question 2

Eye blink artifact is primarily seen at which electrode positions?

Accepted Answer

Frontal electrodes (Fp1, Fp2)

Answer

Occipital electrodes (O1, O2)

Answer

Temporal electrodes (T3, T4)

Answer

Central electrodes (C3, C4)

Question 3

What is the most effective method for reducing 60 Hz electrical interference artifact?

Accepted Answer

Ensuring all electrode impedances are balanced and below 5 kOhm

Answer

Increasing the high-frequency filter to 100 Hz

Answer

Switching to a bipolar montage

Answer

Increasing the recording sensitivity

Question 4

Glossokinetic artifact is caused by movement of which structure?

Accepted Answer

The tongue, which acts as an electrical dipole

Answer

The jaw muscles during chewing

Answer

The scalp muscles during frowning

Answer

The diaphragm during breathing

Question 5

An electrode pop artifact on EEG is characterized by:

Accepted Answer

Abrupt, high-amplitude deflection confined to a single channel

Answer

Gradual onset sinusoidal waveform

Answer

Bilateral synchronous sharp waves

Answer

Rhythmic activity at 14 Hz

Question 6

Muscle artifact from the temporalis muscle can be distinguished from beta activity because muscle artifact typically:

Accepted Answer

Shows frequencies above 20 Hz with irregular sharp morphology maximal at temporal electrodes

Answer

Has a frequency below 8 Hz

Answer

Appears only during sleep

Answer

Is enhanced by hyperventilation