ABA Emissions Control & Environmental Compliance 2

Question 1

Which otoacoustic emission type is generated by two simultaneous pure-tone stimuli presented at frequencies f1 and f2?

Accepted Answer

Distortion product OAE (DPOAE)

Answer

DPOAEs are generated when two pure tones (f1 and f2) interact nonlinearly in the cochlea, producing distortion products at predictable frequencies.

Question 2

TEOAEs are typically absent in ears with hearing sensitivity poorer than approximately:

Accepted Answer

30 dB HL

Answer

TEOAEs are reliably present in ears with normal or near-normal hearing but are consistently absent when cochlear hearing loss exceeds approximately 30 dB HL.

Question 3

Spontaneous otoacoustic emissions (SOAEs) are found in approximately what percentage of normal-hearing ears?

Accepted Answer

Approximately 35–50%

Answer

SOAEs occur without any external stimulus and are present in roughly 35–50% of normal-hearing individuals, more commonly in females.

Question 4

Contralateral suppression of OAEs is used to evaluate the integrity of which pathway?

Accepted Answer

Medial olivocochlear (MOC) efferent reflex

Answer

Contralateral noise activates the medial olivocochlear efferent system, which projects to outer hair cells and suppresses OAE amplitude.

Question 5

In clinical practice, DPOAEs are most commonly measured at a primary tone frequency ratio (f2/f1) of approximately:

Accepted Answer

1.22

Answer

A ratio of f2/f1 ≈ 1.22 produces the largest and most reliable DPOAE responses because it optimizes the nonlinear interaction between the two primary tones.

(ABA) American Board of Audiology Practice Test

(ABA) American Board of Audiology Practice Test

ABA Emissions Control & Environmental Compliance 2