Exam 2 Flashcards
Rules out participation by the non-test ear
Masking
When sound presented to the test ear arrives at the cochlea of the non-test ear
Crossover
How can crossover occur (2)?
Sounds leaks around the headphones and travel by air conduction, BC by vibrations through the skull
Drop in intensity of a sound as it crosses over to the non-test ear
Interaural attenuation
What is the maximum interaural attenuation by AC?
60 dB
What is the minimum interaural attenuation by AC?
40 dB
What is the interaural attenuation we should assume by AC?
40 dB
What is the actual interaural attenuation by AC?
40-50 dB
What is the maximum interaural attenuation by BC?
10-15 dB
What is the minimum interaural attenuation by BC?
0 dB
What is the actual interaural attenuation by BC?
0-10 dB
What interaural attenuation should we assume by BC?
10 dB
Audiogram of left ear or right ear mirrors the other ear and has a difference of 40 dB
Shadow curve
When do we mask during AC?
AC threshold minus of test ear BC of non-test ear is greater than or equal to 40 dB
When do we mask during BC?
AC threshold in test ear minus BC threshold of test ear is greater than 0
What type of noise do we use during masking?
Narrow band
Width of noise necessary same as white noise
Critical band
noise we use for masking is at least __ critical band width-wide
1
What method do we use for masking?
Plateau
Results come from non-test ear; not enough masking
Undermasking
Effective masking
Plateau
Too much noise that it’s making it to the test ear
Overmasking
We present masking in the non-test ear at __ dB above the non-test ear AC threshold
10
What are other terms for immittance audiometry?
Tympanometry, acoustic admittance, impedance audiometry
Tests how well the conductive system moves
Immittance audiometry
Puffing air into the ear canal to see if the tympanic membrane moves
Pneumatic otoscopy
Net opposition of flow of energy
Impedance
What 2 things create impedance?
Resistance, Mass reactance and stiffness
How do we measure compliance?
Place sound source at ear to see if tympanic membrane moves
What does it mean when there is a lot of sound reflecting back from the tympanic membrane?
High stiffness, high impedance, less compliant ear is
