AAO-HNSF Certificate Program for Otolaryngology Personnel

Occlusion Effect

Frequency (Hz)

250

500

1000

2000+

Intensity (dB)

30

20

10

0

AAO-HNS/F

Certificate Program for Otolaryngology Personnel Workshop

19

How much masking? Avoid under-masking and over-masking Find the level of effective masking –What is the true threshold? –How much masking is needed without changing the true threshold?

AAO-HNS/F

Certificate Program for Otolaryngology Personnel Workshop

20

How much masking? Air Conduction Interaural attenuation—How much is crossing over?

Amount of interaural attenuation in the non-test ear + 15 dB effective masking

Add any air-bone gap

If necessary, add occlusion effect

AAO-HNS/F

Certificate Program for Otolaryngology Personnel Workshop

21