Lesson 10 - Masking - Pure Tones

Question 1

Sound being presented to one ear in route to the office here is known as:

a. cross hearing
b. shadow hearing
c. transcranial hearing
d. all of the above

Answer 1

d. all of the above

Question 2

When the better ear ‘answers’ for the poor ear what occurs?

a. shadow curve
b. central hearing
c. overmasking
d. interaural attenuation

Answer 2

a. shadow curve

Question 3

Which noise is best for masking during pure tone air and bone conduction testing?

a. white noise
b. speech noise
c. narrow band noise
d. broad band noise

Answer 3

c. narrow band noise

Question 5

Masking is performed during air conduction testing when:

a. a 40 dB or more difference occurs between the air conduction threshold of the better ear and the poorer ear
b. a 40 dB or more difference occurs between the air conduction threshold of the poorer ear and the bone conduction threshold of the better ear
c. a 15 dB or more difference occurs between the air conduction threshold of the poorer ear and the bone conduction threshold of the better ear
d. a and b

Answer 5

d. a and b

Question 6

Masking is performed during bone conduction testing whenever:

a. a 15 dB or more difference occurs between the obtained bone conduction threshold of the better ear and the obtained air conduction threshold of the poorer ear
b. a 0 dB or more difference occurs between the obtained bone conduction threshold of the better ear and the obtained air conduction threshold of the poorer ear
c. a 40 dB or more difference occurs between the obtained bone conduction threshold of the better ear in the obtained air conduction threshold of the poorer ear
d. a and c
d.

Answer 6

a. a 15 dB or more difference occurs between the obtained bone conduction threshold of the better ear and the obtained air conduction threshold of the poorer ear

Question 7

The occlusion effect occurs during:

a. bone conduction testing causing thresholds shift due to headphones being placed over the ear
b. air conduction testing causing thresholds to shift due to headphones being placed over the ear
c. impedance audiometry
d. bone conduction testing causing threshold to shift due to the oscillator being placed on the the skull

Answer 7

a. bone conduction testing causing thresholds shift due to headphones being placed over the ear

Question 8

A masking dilemma occurs when:

a. it is impossible to mask
b. the patient displays a bilateral conductive loss
c. masking can not be completed due to over masking
d. all of the above

Answer 8

d. all of the above

Question 9

Undermasking is defined as:

a. occurring more often during air conduction testing
b. occurring more often during bone conduction testing
c. an excess of noise created a false threshold
d. masking noise being at least 40 dB above the true threshold

Answer 9

a. occurring more often during air conduction testing

Question 10

Central masking can affect a threshold by:

a. 5 dB
b. 20 dB
c. 40 dB
none of the above

Answer 10

a. 5 dB

Question 11

Effective masking may be described as:

a. an increased masking noise that does not shift the threshold tone
b. a formula method to determine how much masking noise is appropriate
c. A psychoacoustic method like the one proposed by Hood
d. all of the above

Answer 11

d. all of the above