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Evoked Potentials Part 2: Electrocochleography, MLR, P300 and Cortical Response

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1.  When using common mode rejection the voltage difference is measured for the ___________.
  1. Active electrode
  2. Reference electrode
  3. Active & reference electrode
  4. Ground electrode
2.  What should electrode impedance values be?
  1. Impedance is not important
  2. Only interelectrode impedance matters
  3. Less than 5 kOhm for each electrode and less than 2 kOhm between electrodes
  4. Less than 20 kOhm
3.  In Electrocochleography, why would you obtain a larger response using TMtrode versus tiptrode?
  1. Ability to get better impedance
  2. TMtrode is closer to the neural generator
  3. Patient is more relaxed with TMtrode and therefore the noise floor is lower
  4. None of the above
4.  In Electrocochleography, what measurement do you look at to determine whether there is an abnormality in the response?
  1. The AP latency
  2. The cochlear microphonic frequency
  3. The SP/AP ratio
  4. None of the above
5.  In a normal ear for MLR, what happens to the latency of wave V as you decrease intensity?
  1. Wave V latency increases
  2. Wave V latency decreases
  3. Nothing, it stays close to the same
  4. None of the Above
6.  For middle, late and cortical responses, what should the patient state be to obtain the best response?
  1. Asleep
  2. Awake
  3. Sedated
  4. None of the above
7.  For P300 how many types of stimuli are presented?
  1. One toneburst either 1000 or 2000 Hz
  2. One click
  3. Two - a 1000 Hz toneburst and a 2000 Hz toneburst
  4. None of the Above
8.  For the P300 response which waveform should you look at?
  1. Ipsilateral Rare
  2. Contralateral Rare
  3. Ipsilateral Frequent
  4. Contralateral Frequent
9.  If the rare and frequent stimuli are hard to discriminate, what happens to the P300 response?
  1. It decreases in amplitude
  2. The latency shifts to the left
  3. The latency is variable between runs
  4. None of the above
10.  The cortical response is not fully mature until what age?
  1. 5 years old
  2. 30 years old
  3. late teens
  4. 75 years old

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