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Emissions Control & Environmental Compliance Flashcards

7 cards from real ABA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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

    Answer: Distortion product OAE (DPOAE)

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

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

    Answer: 30 dB HL

    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.

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

    Answer: Approximately 35–50%

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

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

    Answer: Medial olivocochlear (MOC) efferent reflex

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

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

    Answer: 1.22

    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.

  6. A DP-gram plots DPOAE amplitude as a function of:

    Answer: f2 frequency across the audiometric range

    A DP-gram displays DPOAE amplitude (and noise floor) at each f2 frequency tested, providing a frequency-specific map of outer hair cell function.

  7. Which type of OAE is best suited for frequency-specific assessment of cochlear function across the audiometric range?

    Answer: Distortion product OAE (DPOAE)

    DPOAEs allow discrete frequency-by-frequency testing across the audiometric range, making them superior for frequency-specific cochlear assessment compared to broadband click-evoked TEOAEs.