OAE Lecture Flashcards
Where does the sound detected during an OAE originate?
Sound originates from the outer hair cells - there are changes in metabolic processes (K+ in and Ca2+ out results in stereocilia bending and changes in the motor-proteins) within the cells that cause it to shrink and grow - this electromotility creates sounds that are detected by the OAE probe
Which is NOT a property of spontaneous otocoustic emissions:
A. They are recordible in approximately 2/3rd of people with normal hearing
B. It is linked with tinnitus in 4% of patients with tinnitus and normal hearing
C. They are generally continuous, low intensity tones that are not heard by the subject
A. - they are only recordable in approximately HALF of the population with normal hearing
What are the advantages of transient evoked OAEs?
• Simple, quick, commonly used and well documented. • Apparatus generally available • General agreement on suitable test protocol • Robust, even in neonates • Sensitive to hearing loss • Present in virtually all normal ears
What are the disadvantages of transient evoked OAEs?
– limited frequency specificity
– not threshold specific: either present or absent
Distortion Product Otoacoustic Emissions (DPOAEs) occur:
A. when nearing threshold
B. when tone-pips are presented to the ear
C. When wide-band-noise is played into the ear
D. at intermodulation frequencies when two or more tones are presented to the ear simultaneously
D
What are the advantages of DPOAEs?
- Equipment commercially available
- Quite quick and robust
What are the disadvantages of DPOAEs?
• Not as commonly used as TEOAEs
• Less agreement about response criteria and protocol
• ?Frequency specificity (prob not, but wider range)
• ?Sensitivity to hearing impairment (still cannot get threshold but
can measure at greater hearing losses)
• Absent in some frequency regions of normal ears
Describe Stimulus-Frequency Otoacoustic
