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Principles of Masking and Interaural Attenuation

Another name for interaural attenuation is? Transcranial transmission loss
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
Test ear Ear upon which the audiogram is being determined
Crossover Where the intensity of the test tone exceed the IA to be present in the test ear
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.
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.
What will the audiogram show if cross hearing is occurring? Worst hearing ear will show a shadow of the better hearing ear
What is masking? The use of noise to prevent detection of the test tone in the NTE
Effective masking noise is calibrated to ... above test tone 4-6dB
How does masking work? Masking noise has test frequency at it's centrepoint - brain does not respond to presence of test tone
Equation for whether cross hearing occurs Intensity of test tone - IA > bone conduction threshold in NTE
Effective masking The intensity of masking noise required to mask a test tone of the 'same' intensity
Created by: Youworktoohard