1. Which of the following would best enhance resolution of evoked potentialwaveforms?
Answer: Increase number of averaged stimuli
2. What is the typical MINIMUM common mode rejection ratio of in-phasesignals
recommended for evoked potential instruments?
Answer: 10,000:1
3. Which of the following cranial nerves is most at risk during acoustic neuro-ma surgery?
Answer: CN VII
4. The impedance of cup electrodes is:
Answer: Lower than needle electrodes becauseof their size
5. Amplitude of an evoked potential depends on which of the following physiological actions
in a sensory pathway?
Answer: The number of cortical or subcortical generators simultaneously activated.
6. Posterior Fossa
Answer: Brainstem
7. Using the International 10-20 electrode placements, if the measurementfrom nasion to
inion is 30 cm, what is the distance from Fz to Cz?
Answer: 6 cm
8. Which of the following most likely results in increased firing of a neuron?-
Answer: Excitatory postsynaptic potential
9. Compared to electrode impedance, the input impedance of the amplifiershould be
Answer: Higher
10. The appropriate stimulusintensity ofstimulating median nerve at the wristfor recording
SEP is:
Answer: Just above motor threshold
11. The recommended amplitude resolution of the analog to digital convertermust be a
MINIMUM of
Answer: 8 bits
12. If the trials are not reproducible
Answer: Perform an additional trial
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