Quiz 2

Question 1

Masking

Answer 1

a procedure audiologists use while testing to separate the two ears acoustically

Question 2

Test ear

Answer 2

Ear currently being tested

Question 3

Non-test ear

Answer 3

one not being tested

Question 4

How to separate the ears?

Answer 4

Covering one and then testing the other to determine if it is normal or impaired

Question 5

The amount of masking noise required depends on the amount of signal that may crossover

Question 6

Noise is introduced to the non-test ear while the test ear is evaluated with a tone

Question 7

How do you indicate that the hearing thresholds were obtained?

Answer 7

Masked threshold symbols

Question 8

Cross-Hearing

Answer 8

Differences at the same frequency between the 2 ears

the patient will respond to the test stimuli before their true threshold has been reached

Question 9

Interaural Attenuation

Answer 9

the amount of sound intensity that is reduced when crossing from the test ear to the non test ear

reduces crossover

Question 10

Supra Aural Headphones

Answer 10

average IA values across all frequencies for air conduction tend to be around 60-40 dB

Question 11

Interaural Attenuation for Bone Conduction

Answer 11

Adult skulls are fused at the cranial structures

If you vibrate any part of the head equal vibrations will transmit to the entire head bone and cochlea

Almost no IA in BC testing

Question 12

Masking for Air Conduction

Answer 12

General Rule: compare the air conduction thresholds of the test ear with the bone conduction thresholds of the non test ear

Question 13

When should you mask?

Answer 13

Super aural headphones: if the difference between the non test ear BC and test ear AC thresholds is 40 dB or more

Insert Headphones: if the difference is 60 dB or more between the non-test BC and test ear AC thresholds

Question 14

What is the difference between the bone conduction theshold vs air conduction threshold?

Answer 14

Air bone gap

Question 15

Occlusion Effect

Answer 15

During bone conduction testing only

Occurs when the occluded ear canal traps the BC signal energy

Bone conduction masking requires a correction factor for the occlusion effect

Question 16

Overmasking

Answer 16

When the masking noise is so intense in the masked ear that it crosses the skull and produces an undesired masking of the test signal in the ear

Question 17

Undermasking

Answer 17

The assumption that the threshold of the tone in the test ear has not been reached and that both the tone and noise are heard by the non test ear

Question 18

Central Masking

Answer 18

the belief that the elevation of threshold is produced by inhibition that is sent down from the auditory centers in the brain

Question 19

Masking Dilemma

Answer 19

not finding the masking plateau

occurs when the hearing loss causes the masking levels presented in the non-test ear to cross over to the test ear and elevates the threshold

solution: use insert earphones

Question 20

Immittance

Answer 20

used as an all-encompassing term to describe measurements made of tympanic membrane impedance, compliance, or admittance

also known as “middle ear measurements” or impedance audiometry