AAO-HNSF Certificate Program for Otolaryngology Personnel

How Much Masking for Speech Audiometry? Presentation level in the test ear – IA +15 dB = Effective Masking. EM = 70 – 40 +15

Ear

Presentation Level

Masking Level

Right

40 dB

No Masking

Left

70 dB

45

AAO-HNS/F

Certificate Program for Otolaryngology Personnel Workshop

31

How Much Masking? Bone Conduction

Air conduction threshold in the non-test ear + occlusion effect + 15 dB

15 15

AAO-HNS/F

Certificate Program for Otolaryngology Personnel Workshop

32

Occlusion Effect

• An artificial improvement in low frequency threshold when the ear canals are covered

• Occurs when testing bone conduction with the headphones on the non-test ear

AAO-HNS/F

Certificate Program for Otolaryngology Personnel Workshop

33