ESSENTIALS OF POLYSOMNOGRAPHY ACTUAL
EXAM PAPER 2026 QUESTIONS SOLUTIONS
GRADED A+
◉ The E2 electrode is placed out and up from the outer canthus of
the right eye, and E1 is placed out and down from the outer canthus
of the left eye. If the E2 channel on the PSG is channel 4, and E1 is
channel 5, what will the waves on these channels do when the
patient looks up? Answer: Move towards each other.
◉ What is the purpose of the Low Frequency Filter? Answer:
Eliminating undesired slow frequencies
◉ What should a technician do first to make sure the proper test is
being performed? Answer: Review the chart for the physician's
orders
◉ The symbol "G1" represents: Answer: The exploring electrode
◉ If G1 receives a signal of -100uV at the same time G2 receives a
signal of -50uV, what is the output signal? Answer: -50 uV
,◉ Which of the following is a process performed by a differential
amplifier? Answer: Recording the differences in the voltage of two
(2) inputs.
◉ If G1 and G2 simultaneously receive an input of 50uV, what is the
output signal?
(G1 - G2 = x)
(50uV - 50uV = x) Answer: 0
G2 - G1 = X
◉ The frequency of an EEG signal: Answer: Can be determined by
counting the number of waveforms recorded during one second.
◉ How is the amplitude of a wave determined? Answer: By
comparing the height of the waveform against a calibration signal of
known value.
◉ The purpose of a high frequency filter is: Answer: To attenuate
undesirable fast frequencies.
◉ In PSG, what is the sensitivity setting?
,(Sensitivity = ISV / Pen deflection) Answer: The ratio of input signal
voltage to the amplitude of the pen deflection.
◉ An appropriate EEG sensitivity setting is: Answer: 5uV/mm and
50uV/cm
◉ Amplitude is a measure of: Answer: Voltage of the signal
◉ Adjusting the sensitivity from 5uV/mm to 10uV/mm will:
Answer: Reduce the pen deflection by one half
◉ The standard paper speed used for a sleep study is: Answer: 10
mm/sec
◉ Which of the following filter settings would be most appropriate
for EEG channels on a sleep study? Answer: LFF 0.3 Hz, HFF 35 Hz
◉ Which of the following filter settings are the most appropriate for
recording EMG channels? Answer: LFF 10 Hz, HFF 100 Hz
◉ Which of the following filter settings should be used for recording
airflow and respiratory effort? Answer: LFF 0.1 Hz, HFF 15 Hz
, ◉ What is the major difference between AC and DC amplifiers?
Answer: AC amplifiers have a high frequency filter, while DC
amplifiers do not.
◉ The quality and accuracy of a sleep recording is mostly
determined by: Answer: Proper electrode application
◉ The purpose of physiologic calibrations is to: Answer: Establish
certain scoring references for the sleep study. Verify signal
derivation for each channel. Confirm the integrity of the signals.
◉ The recording of eye movements is based on: Answer: The
electrical potential difference between the cornea and the retina.
◉ If the low frequency filter is increased from 0.3 Hz to 1 Hz in an
EEG channel, how will the affect the recording? Answer: The 1Hz
setting will decrease the amplitude of slow waves.
◉ The right and left outer cants electrodes (E2 and E1) are
referenced to an opposite mastoid. According to the polarity
convention, an eye movement to the right should result in: Answer:
A downward pen deflection in the E2 channel and an upward pen
deflection in the E1 channel.
EXAM PAPER 2026 QUESTIONS SOLUTIONS
GRADED A+
◉ The E2 electrode is placed out and up from the outer canthus of
the right eye, and E1 is placed out and down from the outer canthus
of the left eye. If the E2 channel on the PSG is channel 4, and E1 is
channel 5, what will the waves on these channels do when the
patient looks up? Answer: Move towards each other.
◉ What is the purpose of the Low Frequency Filter? Answer:
Eliminating undesired slow frequencies
◉ What should a technician do first to make sure the proper test is
being performed? Answer: Review the chart for the physician's
orders
◉ The symbol "G1" represents: Answer: The exploring electrode
◉ If G1 receives a signal of -100uV at the same time G2 receives a
signal of -50uV, what is the output signal? Answer: -50 uV
,◉ Which of the following is a process performed by a differential
amplifier? Answer: Recording the differences in the voltage of two
(2) inputs.
◉ If G1 and G2 simultaneously receive an input of 50uV, what is the
output signal?
(G1 - G2 = x)
(50uV - 50uV = x) Answer: 0
G2 - G1 = X
◉ The frequency of an EEG signal: Answer: Can be determined by
counting the number of waveforms recorded during one second.
◉ How is the amplitude of a wave determined? Answer: By
comparing the height of the waveform against a calibration signal of
known value.
◉ The purpose of a high frequency filter is: Answer: To attenuate
undesirable fast frequencies.
◉ In PSG, what is the sensitivity setting?
,(Sensitivity = ISV / Pen deflection) Answer: The ratio of input signal
voltage to the amplitude of the pen deflection.
◉ An appropriate EEG sensitivity setting is: Answer: 5uV/mm and
50uV/cm
◉ Amplitude is a measure of: Answer: Voltage of the signal
◉ Adjusting the sensitivity from 5uV/mm to 10uV/mm will:
Answer: Reduce the pen deflection by one half
◉ The standard paper speed used for a sleep study is: Answer: 10
mm/sec
◉ Which of the following filter settings would be most appropriate
for EEG channels on a sleep study? Answer: LFF 0.3 Hz, HFF 35 Hz
◉ Which of the following filter settings are the most appropriate for
recording EMG channels? Answer: LFF 10 Hz, HFF 100 Hz
◉ Which of the following filter settings should be used for recording
airflow and respiratory effort? Answer: LFF 0.1 Hz, HFF 15 Hz
, ◉ What is the major difference between AC and DC amplifiers?
Answer: AC amplifiers have a high frequency filter, while DC
amplifiers do not.
◉ The quality and accuracy of a sleep recording is mostly
determined by: Answer: Proper electrode application
◉ The purpose of physiologic calibrations is to: Answer: Establish
certain scoring references for the sleep study. Verify signal
derivation for each channel. Confirm the integrity of the signals.
◉ The recording of eye movements is based on: Answer: The
electrical potential difference between the cornea and the retina.
◉ If the low frequency filter is increased from 0.3 Hz to 1 Hz in an
EEG channel, how will the affect the recording? Answer: The 1Hz
setting will decrease the amplitude of slow waves.
◉ The right and left outer cants electrodes (E2 and E1) are
referenced to an opposite mastoid. According to the polarity
convention, an eye movement to the right should result in: Answer:
A downward pen deflection in the E2 channel and an upward pen
deflection in the E1 channel.
