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audiology - masking

puretone and speech masking

why do we mask sounds can cross over to the other ear so we want to make sure the the ear we're testing is the one responding used for bone and air conduction
interaural attenuation How much sound is lost as the sound travels across the skull between ears. works for bone and air conduction testing amount varies with the frequency of the tone. low frequency tones loose less energy traveling across the skull than high frequency tones.
how much sound is lost in interaural attenuation At low frequencies (250Hz) there is 0dB lost. At 4KHz you lose 15dB from ear to ear.
what is the avg. amount of sound lost via bone conduction 5-10dB
what is the avg. amount of sound lost via air conduction 45dB energy lost between the two ears
Masking rule #1 if there is asymmetry of 15dB or more by air conduction TH in the two ears, mask the better ear when you test the poorer ear by bone conduction
masking rule #2 mask whenever bone conduction is better than air conduction thresholds
masking rule #3 if air conduction threshold in 1 ear is 45dB or more worse than the AC thresholds in the other ear, you need to mask the better ear and retest the poorer ear by air conduction
masking rule #4 when air conduction is the same in both ears and bone testing is the same, you don't need to mask
what is masking when we hear two sounds a the same time and one prevents you from hearing the other one music at a party drowns out someone talking to us
Created by: Schauna Gillam Schauna Gillam on 2010-04-03

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