Interpretation of Masking Function
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each of the black spaces below before clicking
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| Where Cross hearing is not present |
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| What is Undermasking? | Where the masking level is audible but has no masking effect.
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| When can it affect the function? | Up to 10dB above Effective masking - check masking is on!
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| Where are the tone and masking heard? | Both heard in the NTE
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| Direct peripheral masking is? | Threshold of NTE is being raised but is still detecting tones more easily than the test ear
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| When does this occur? | Until the true threshold, central masking or overmasking is reached
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| What if DPM occurs until you can go no louder? | Use the not heard descriptor on the audiogram
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| What are the limits of the audiometer? | ????????????????
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| What is central masking? | Inability of the brain to detect test tones in the presence of masking
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| Why does this occur? | The masking and test tone interact in the Central Auditory System reducing the sensitivity of the test tone.
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| How is this shown on the masking function? | A slope of less than 45 degrees
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| If there is a 5dB increase at the end of the plateau... | Higher masking levels should be used to evaluate the function
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| How is this shown on the masking function? | 1dB by 1dB slope after the start of a plateau
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| Where is the true threshold in the case of overmasking? | Where the plateau started to form - even if only two points
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| How is cross masking and hearing conducted? | Bone conduction
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| The level cross hearing occurs depends on... | ...cochlear sensitivity in the NTE
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| Give an example of where cross masking may be a problem. | Where the NTE has a conductive loss with good bone conduction and the TE has at least a moderate loss.
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| Why is this? | The NTE with require higher levels of masking to reach the cochlea which may cross over and mask the TE.
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| High levels of masking, despite being loud can also... | ... exacerbate tinnitus
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