Masking

Question 1

IA for AC =

IA for BC =

Answer 1

IA for AC = 40 dB

IA for BC = 0 dB

Question 2

Masking uses _ noises that are _ in frequency to the tone

Answer 2

Masking uses narrowband noises that are close in frequency to the tone

Question 3

What is the rule for masking, initial tone level, and initial masking level for AC?

Answer 3

Rule: 40 dB difference between AC TE & BC NTE
Initial Tone: Unmasked AC TE
Initial Masking: 10 dB above AC NTE

Question 4

What is the rule for masking, initial tone level, and initial masking level for BC?

Answer 4

Rule: 15 dB difference between unmasked BC & AC, only up to 4,000 Hz
Initial Tone: Unmasked BC TE
Initial Masking: 10 dB above AC NTE + occlusion effect

Question 5

What is the added occlusion effect for 250-4,000 Hz?

Answer 5

250 Hz –> 30 dB
500 Hz –> 20 dB
1,000 Hz –> 10 dB
2,000-4,000 Hz –> 0 dB

Question 6

Give an example of plateau:

Answer 6

Masking – Response —Tone

• – 40 ————- X ———– 0
• – 40 ————- X ———– 5
• – 40 ————- + ———– 10
• – 50 ————- + ———– 10
• – 60 ————- + ———– 10

20 dB difference staying at 10dB tone
Effective masking/plateau level = 10dB

Question 7

What is the formula for the masking dilemma?

Answer 7

ML NTE > IA + BC TE

Question 8

Cross-over occurs when the signal is _ _ in the opposite ear

Answer 8

Cross-over occurs when the signal is physically present in the opposite ear

Question 9

Cross hearing occurs when the crossed sound is _ by the NTE

Answer 9

Cross hearing occurs when the crossed sound is audible by the NTE

Question 10

In audiology we use _ masking

Answer 10

In audiology we use contralateral masking

Question 11

Sound interferes with another most effectively when:

Answer 11

Sound interferes with another most effectively when the two sounds are close in frequency

Question 12

Why is the occlusion effect not observed for people with a conductive hearing loss?

Answer 12

The increase in sound pressure created by the occlusion effect is attenuated by the hearing loss

Question 13

What is a vibrotactile response?

Answer 13

Response to the feeling of vibration rather than the sound

Question 14

A vibrotactile response is more likely to occur in the:

Answer 14

A vibrotactile response is more likely to occur in the lower frequencies

Question 15

What is a shadow audiogram?

Answer 15

When the unmasked thresholds for the poorer ear actually result from “cross-hearing”

Question 16

If someone has a collapsing ear canal, they have greater air bone gaps at _ frequencies

Answer 16

If someone has a collapsing ear canal, they have greater air bone gaps at higher frequencies