EEG BOARD MIDTERM EXAM
QUESTIONS AND ANSWERS 100%
VERIFIED. JUST RELEASED
1. If the distance between the Nasion and Inion is 36 cm, what is the distance from the Nasion
to Fpz?
A. 1.8 cm
B. 10.0 cm
C. 7.2 cm
D. 3.6 cm
Answer: D
Conceptual Explanation: In the 10-20 system, the distance from Nasion to Fpz is 10% of
the total Nasion-Inion distance. 10% of 36 cm is 3.6 cm.
2. Which of the following filters would best help reduce interference from sweat artifact?
A. LFF 5.0 Hz
B. LFF 0.5 Hz
C. HFF 35 Hz
D. HFF 70 Hz
,Answer: A
Conceptual Explanation: Sweat artifact is a low-frequency potential (slow sway).
Increasing the Low Frequency Filter (LFF) to 5.0 Hz helps attenuate these slow frequencies.
3. According to the ACNS guidelines, what is the minimum number of scalp electrodes
required for a standard clinical EEG?
A. 16 electrodes
B. 19 electrodes
C. 25 electrodes
D. 21 electrodes
Answer: D
Conceptual Explanation: Standard EEG recordings require the 21 electrodes of the
International 10-20 system to provide adequate spatial coverage.
4. What is the effect of increasing the sensitivity from 7 uV/mm to 10 uV/mm?
A. The wave height decreases
B. The wave height increases
C. The wave frequency increases
D. The wave frequency decreases
Answer: A
, Conceptual Explanation: Sensitivity is inversely proportional to the amplitude of the
display. A higher numerical sensitivity value (10 uV/mm) results in smaller (shorter)
deflections.
5. The Common Mode Rejection Ratio (CMRR) of an EEG amplifier should be at least:
A. 60 dB
B. 120 dB
C. 100 dB
D. 80 dB
Answer: D
Conceptual Explanation: Modern EEG amplifiers require a CMRR of at least 80 dB
(preferably 100 dB or higher) to effectively eliminate common-mode noise like 60 Hz
interference.
6. Which EEG pattern is most characteristic of Hepatic Encephalopathy?
A. PLEDs
B. Triphasic waves
C. Hypsarrhythmia
D. 3 Hz Spike and Wave
Answer: B
QUESTIONS AND ANSWERS 100%
VERIFIED. JUST RELEASED
1. If the distance between the Nasion and Inion is 36 cm, what is the distance from the Nasion
to Fpz?
A. 1.8 cm
B. 10.0 cm
C. 7.2 cm
D. 3.6 cm
Answer: D
Conceptual Explanation: In the 10-20 system, the distance from Nasion to Fpz is 10% of
the total Nasion-Inion distance. 10% of 36 cm is 3.6 cm.
2. Which of the following filters would best help reduce interference from sweat artifact?
A. LFF 5.0 Hz
B. LFF 0.5 Hz
C. HFF 35 Hz
D. HFF 70 Hz
,Answer: A
Conceptual Explanation: Sweat artifact is a low-frequency potential (slow sway).
Increasing the Low Frequency Filter (LFF) to 5.0 Hz helps attenuate these slow frequencies.
3. According to the ACNS guidelines, what is the minimum number of scalp electrodes
required for a standard clinical EEG?
A. 16 electrodes
B. 19 electrodes
C. 25 electrodes
D. 21 electrodes
Answer: D
Conceptual Explanation: Standard EEG recordings require the 21 electrodes of the
International 10-20 system to provide adequate spatial coverage.
4. What is the effect of increasing the sensitivity from 7 uV/mm to 10 uV/mm?
A. The wave height decreases
B. The wave height increases
C. The wave frequency increases
D. The wave frequency decreases
Answer: A
, Conceptual Explanation: Sensitivity is inversely proportional to the amplitude of the
display. A higher numerical sensitivity value (10 uV/mm) results in smaller (shorter)
deflections.
5. The Common Mode Rejection Ratio (CMRR) of an EEG amplifier should be at least:
A. 60 dB
B. 120 dB
C. 100 dB
D. 80 dB
Answer: D
Conceptual Explanation: Modern EEG amplifiers require a CMRR of at least 80 dB
(preferably 100 dB or higher) to effectively eliminate common-mode noise like 60 Hz
interference.
6. Which EEG pattern is most characteristic of Hepatic Encephalopathy?
A. PLEDs
B. Triphasic waves
C. Hypsarrhythmia
D. 3 Hz Spike and Wave
Answer: B
