Chapter 11 - Masking Flashcards
Masking is defined as an acoustical technique which allows the specialist to test the better ear while sending noise to the poorer hearing ear.
A. True.
B. False.
B. False.
Masking is made difficult-to-impossible when the specialist:
A. Overmasks.
B. Undermasks.
C. Does not prepare the patient for the possibility that sounds just might be heard by the opposite ear.
D. All of the above.
E. A.
F. A and B.
D. All of the above.
The type of noise or signal used in masking is _____.
A. White noise.
B. Wide band noise.
C. Pure tones.
D. Low tones.
E. Narrow band noise.
E. Narrow band noise.
You never ask the patient whether he or she has a better ear.
A. True.
B. False.
B. False.
One way to easily determine whether the patient has a better ear is to _____.
A. Notice a turning of one ear toward a speaker.
B. Ask which ear the patient uses to talk on the phone.
C. Ask the patient.
D. Test the patient.
E. All of the above.
F. A, B, and C.
F. A, B, and C.
Interaural attenuation is defined as the reduction in intensity, at one ear, of an acoustic stimulus presented to the other ear canal as the sound is transmitted through the head.
A. True.
B. False.
C. Not enough information.
A. True.
For air conduction, the reduction (attenuation) is approximately 40 dB.
A. True.
B. False. It is 60.
C. False. It is 50.
D. False. It is 0.
A. True.
For bone conduction, the attenuation is accepted as between 0 dB and 10 dB.
A. True.
B. True, but it is usually 0.
C. False.
D. False. It is usually 40.
E. False. It is usually 70.
B. True, but it is usually 0.
Crossover occurs when the sound presented to one ear crosses over to the other ear and is heard at the NTE (non-test-ear).
A. True.
B. False.
A. True.
If you do not prepare the patient for the possibility of masking, _____.
A. The patient may offer false positive indications when crossover does occur.
B. The patient will notice anyway.
C. The test will be worthless.
D. You will find out eventually.
F. A and B.
A. The patient may offer false positive indications when crossover does occur.
Regarding the occlusion effect, you send sounds generated by AC as you also test that ear, and determine occlusion in the other ear.
A. True.
B. False
B. False
Below _____ Hz, when the outer ear of the test ear (TE) is occluded by a headset, BC is in a more/less sensitive state.
A. 1000 Hz/less
B. 1000 Hz/more.
C. 2000 Hz/less.
D. 2000 Hz/more.
D. 2000 Hz/more.
Following up, this is why you place the TE AC headphone well above and behind the test ear.
A. True.
B. True. Otherwise, you will receive false positive responses.
C. False.
B. True. Otherwise, you will receive false positive responses.
You elimiate occlusion by:
A. Only occluding the NTE with your headset.
B. You add 15 dB to the beginning masking level by AC in the NTE at 250 and 500 Hz, and 10 dB at 1000 Hz if you test those freq’s.
C. A and B.
D. A.
E. B.
C. A and B.
Central masking is a phenomenon whereby:
A. The CSC produces masking.
B. The CNS produces sounds that can increase a masked score by up to 15 dB.
C. The CNS produces sounds that can increase a masked score by up to 35 dB.
B. The CNS produces sounds that can increase a masked score by up to 15 dB.
You can compensate for central masking by _____.
A. Increasing the signal by 15 dB.
B. Adding 15 dB to all audiogram postings.
C. Averaging all masking scores.
D. You can’t compensate for it.
D. You can’t compensate for it.
IA through headsets = _____ dB.
A. 0.
B. 15.
C. 30.
D. 40
E. 70
D. 40
IA [speech] through headsets = _____.
A. 0.
B. 15.
C. 40.
D. 70.
E. You don’t test for speech in this procedure.
C. 40.
IA [BC] = _____.
A. 0.
B. 15.
C. 40.
D. 70.
E. You don’t test with BC in this procedure.
A. 0.
When you discover that you need to mask, you must know the threshold of the _____ ear.
A. Poorer.
B. Better.
C. Neither.
B. Better.
When you discover you have to mask, the ear you are trying to determine the threshold for is the _____ ear.
A. Better.
B. Poorer.
C. Both.
B. Poorer.
When you start searching for the effective masking plateau, some texts recommend that you add _____ dB to the AC threshold of the better ear to make sure the starting level of masking is more _____.
A. 0/effective.
B. 10/effective.
C. 20/audible.
D. 10/audible.
D. 10/audible.
When you take your very first masking step, it is probably _____.
A. Inaudible.
B. Undermasking.
C. Effective.
D. Overmasking.
B. Undermasking.
Due to IA, the final masking level will be within _____ dB from the positive response of the TE.
A. Don’t know the final level.
B. 0.
C. 15.
D. 40.
E. 70.
D. 40.
If you do not present enough NBN intensity, what phenomenon can occur?
A. Interaural attenuation.
B. Cross masking.
C. Inter-masking.
D. Cross testing.
E. Crossover.
E. Crossover.
To obtain a true threshold, a 15 to 20 dB increase in masking noise while simultaneously recording the same threshold in TE, is required. This allows and compensates for an actual IA different than 40 dB.
A. True.
B. False.
A. True.
You set your masking level for the NTE at the PT threshold plus 10 dB. The next step is to _____.
A. Test the poorer ear.
B. Use the 10 down/5 up procedure until you find the threshold.
C. Neither.
A. Test the poorer ear.
Once you reach the threshold, you increse the masking noise on the NTE by _____ dBs, and test again. When you have increased the masking noise by _____ dBs in total without a change in the threshold of the poorer ear, you have reached the threshold.
A. 10/30.
B. 15/45.
C. 5/15.
D. 5/25.
C. 5/15.
Following up, this means that you increase masking at the suspected effective masking threshold in at least _____ steps without a change in the threshold response.
A. 2.
B. 3.
C. 4.
D. 5.
B. 3.
Using too much masking noise can _____.
A. Not do any harm to the patient.
B. Frustrate and annoy the patient.
C. Cross over and mask the TE tone, falsely increasing the threshold.
D. B and C.
C. Cross over and mask the TE tone, falsely increasing the threshold.
Maximum masking is reached when MM = BC + _____ dB.
A. 0.
B. 15.
C. 35.
D. 45.
E. 75.
C. 35.
Even if the patient does not give positive indications of crossover, the rule of thumb for conducting a masking procedure is to do so when the AC thresholds are _____ dB apart.
A. 0.
B. 15.
C. 20.
D. 30.
E. 40.
E. 40.
When both ears have an AB [air-bone] gap of at least 40 dB, you have a _____.
A. Mixed HL.
B. Conductive HL.
C. Otosclerosis.
D. Infected tympanic membrane.
E. Masking dilemma.
E. Masking dilemma.
The answer to a masking dilemma is for you to _____.
A. Get a medical waiver signature and fit with hearing instruments.
B. Re-test with more masking noise.
C. Fit the better ear.
D. Fit the poorer ear.
E. Refer to an ENT.
E. Refer to an ENT.
It is more accurate to leave the NBN on all the time while masking.
A. True.
B. False.
B. False.
According to Hood, increase the NBN in 10 dB steps if the tone is heard.
A. True.
B. False.
A. True.
Or, follwing with the previous question, you increase the pure tone in _____ dB steps if the tone does not elicit a response from the patient.
A. 5.
B. 10.
C. 15
D. 20
E. 25
A. 5.
Then, you stop when the threshold is found when you have _____ consecutive responses with a 15 dB increase in NBN.
A. 1.
B. 2.
C. 3.
D. 4.
E. 5.
C. 3.
BC masking is required when the ABG [air-bone gap] is equal to or greater than _____ in that ear.
A. 5.
B. 10.
C. 15.
D. 20.
E. 40.
C. 15.
The only unique difference between AC Masking and BC Masking is that when you test at 250, 500, and 1000 Hz, you add _____, _____, and _____ dB respectively to compensate for occlusion.
A. 5, 10, 15.
B. 15, 10, 5.
C. 15, 15, 10.
D. 25, 20, 15.
C. 15, 15, 10.
The final masking level in the BC procedure will equal the BC of the TE plus _____ dB.
A. 15.
B. 25.
C. 35.
D. 45.
E. 55.
Not A
The only different element in SRT Masking compared to AC masking is that you substitute _____ for _____.
A. Easy words/1000 Hz tones.
B. SRT words/bone conduction tones.
C. WDS words/pure tones.
D. SRT word/pure tones.
D. SRT word/pure tones.
You also use plateaus in SDS masking procedures.
A. True.
B. False.
B. False.
The key to learning effective masking is to _____.
A. Review until you know you have memorized the procedures.
B. Practice.
C. Practice.
D. Practice.
E. All of the above.
E. All of the above.
SDS masking levels are the _____ minus _____.
A. UCL/35 dB.
B. MCL/35 dB.
C. UCL/40 dB.
D. MCL/40 dB.
D. MCL/40 dB.
