Principles of Masking and Interaural Attenuation
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| Another name for interaural attenuation is? | Transcranial transmission loss
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| Where the acuity of the ears is very different, there is a possibility that... | The NTE hears the sounds at a lower dB level despite interaural attenuation
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| Test ear | Ear upon which the audiogram is being determined
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| Crossover | Where the intensity of the test tone exceed the IA to be present in the test ear
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| Cross Hearing | Where the intensity of the test tone exceeds the IA and the bone conduction threshold for the NTE and is detected in the NTE.
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| Why do we use 40dB when the interaural attenuation could be much higher, e.g. 80dB attenuation | To ensure all subjects receive the right amount of attenuation as those with higher IA will not be affected by masking.
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| What will the audiogram show if cross hearing is occurring? | Worst hearing ear will show a shadow of the better hearing ear
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| What is masking? | The use of noise to prevent detection of the test tone in the NTE
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| Effective masking noise is calibrated to ... above test tone | 4-6dB
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| How does masking work? | Masking noise has test frequency at it's centrepoint - brain does not respond to presence of test tone
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| Equation for whether cross hearing occurs | Intensity of test tone - IA > bone conduction threshold in NTE
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| Effective masking | The intensity of masking noise required to mask a test tone of the 'same' intensity
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