Exam 3 Part 2 Flashcards
Ears that have _____ hearing produce otoacoustic emissions
Normal
What types of activities do otoacoustic emissions reflect?
Outer hair cell activity
What are the 2 types of OAE’s?
Spontaneous and evoked
True or false: Not everyone with normal hearing may not have spontaneous otoacoustic emissions (SOAE’s)
True
OAE that uses a transient (clicking) noise, can be random and should be able to hear it
Transient evoked OAE (TOAE)
How can you tell that a transient evoked otoacoustic emission has an emission?
Do 1 click and put into buffer A, do another click and put into buffer B, if both buffers are the same then an emission is present
How many dB must it be above the noise floor to be counted as an emission?
3-6 dB
OAE that uses continuous tones as a stimulus (2 pure tones); able to test specific regions of the cochlea
Distortion product (DPOAE)
Products of the cochlea known as summation or difference tones
Intermodulation distortion
What does it mean when there are no distortion products?
No emission is present
Why do we look at the cubic difference tone?
Last tone to disappear and is only made by the cochlea
What is the cubic difference tone?
2f1 - f2
Shows emissions and noise floor
DP graph/gram
If emissions are on a noise floor, is it counted as an emission or not?
Not
What will emissions be like if there is middle ear fluid?
Drop significantly because it has to travel back and forth out of the ear canal; intensity will also drop
When is the cut off to test for emissions?
30 dB or below
at ___ dB or greater sensory hearing loss, you will not be able to measure/generate emissions
30
What is one inference you can make from OAE’s?
Source of hearing loss
What creates emissions?
Outer hair cell activity
Tells us if it is a sensory or neural hearing loss
OAE
True or false: if there is a greater than 30 dB conductive hearing loss, you won’t be able to see emissions on the test
True
True or false: if there is a greater than 30 dBHL sensory hearing loss you will be able to produce emissions
False
True or false: if there is a greater than 30 dBHL neural hearing loss, you will be able to measure emissions
True
