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CD 443 Exam 3: Questions With Accurate Answers
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CD 443 Exam 3: Questions With Accurate Answers
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CD 443 Exam 3: Questions With Accurate AnswersWho first reported OAEs? When? Right Ans - David Kemp, 1979
What generates OAEs? Right Ans - Outer hair cells
Outer hair cells amplify BM response for ______ sounds. Right Ans - Low
level (quiet)
OAEs are a by-product of what? Right Ans - OHC motility
What are the two broad classes of OAEs? Right Ans - 1) Spontaneous OAEs
(SOAEs)
2) Evoked OAEs (EOAEs)
What are SOAEs? Right Ans - Continuous tonal signals that occur without
stimulation
SOAEs are present in what percent of normal ears? Right Ans - 50%
True or false: A person may have multiple EOAEs are several different
frequencies. Right Ans - False - SOAEs
What are EOAEs? Right Ans - OAEs that are produced in response to an
acoustic stimulus
What are two types of EOAEs? Right Ans - 1) Transient evoked OAEs
(TEOAEs)
2) Distortion product OAEs (DPOAEs)
What are two choices for evoking stimuli of TEOAEs? Right Ans - 1) Clicks
2) Tone pips
What are tone pips? Right Ans - Very brief pure tones
What does the ear produce in response to tone pips? Right Ans - A
broadband sound
, What is the evoking stimuli for DPOAEs? Right Ans - 2 steady pure tones
presented simultaneously aka "primaries"
What is the relationship between F1 and F2, and L1 and L2 related to
DPOAEs? Right Ans - F2 > F2, L1 > L2
Typically what does F2/F1 equal? Right Ans - 1.22
In clinic what are the typical values for L1 and L2? Right Ans - L1 = 65 dB
SPL
L2 = 55 dB SPL
When is the response of DPOAEs maximized at? Right Ans - 2F1 - F2
What is a DP-gram? Right Ans - A plot of DPOAE amplitudes as a function of
F2
What does each point on a DP-gram reflect? Right Ans - The health of the
cochlea (OHCs) at the F2 frequency
What 2 things are required to get a normal OAE? Right Ans - 1) Cochlea has
to generate the emission
2) Ear has to transmit this emission in 2 ways
What 2 ways does the ear transmit the emission during an OAE test? Right
Ans - 1) Stimulus has to reach the cochlea
2) Emission has to reach the ear canal
What is required for the cochlea to generate the OAE? Right Ans - No more
than a mild SNHL ( < 40 dB HL)
What is electroencephalography? Right Ans - EEG, measuring electrical
activity from the brain
What are evoked potentials (EPs)? Right Ans - Electrical potentials that are
evoked by a stimulus or event
What two things evoke an EP? Right Ans - 1) Stimulus
2) Event
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