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Audiology and Hearing Sciences Flashcards

6 cards from real CCC 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. Noise-induced hearing loss (NIHL) preferentially affects which frequency region on the audiogram?

    Answer: 4000 Hz (4 kHz notch)

    NIHL characteristically produces a 'noise notch' at 4000 Hz (4 kHz) due to the resonance properties of the ear canal and mechanical vulnerability of that cochlear region.

  2. The OSHA permissible exposure limit (PEL) for occupational noise is 90 dB SPL for how many hours per day?

    Answer: 8 hours

    OSHA sets the PEL at 90 dB SPL for an 8-hour workday, with a 5 dB exchange rate for each halving of duration.

  3. Which type of hearing protection device (HPD) provides the highest noise reduction rating (NRR) in ideal conditions?

    Answer: Foam earplugs

    Foam earplugs have the highest published NRR values (up to 33 dB) when properly inserted, exceeding earmuffs in ideal conditions.

  4. Auditory neuropathy spectrum disorder (ANSD) is characterized by which audiological finding pattern?

    Answer: Present OAEs or CM with absent or abnormal ABR

    ANSD is characterized by present OAEs (reflecting intact outer hair cells) or cochlear microphonic (CM) but absent or abnormal ABR, indicating dyssynchronous neural firing.

  5. Which amplification fitting approach is most commonly used as the prescriptive target for adult hearing aid fittings?

    Answer: NAL-NL2

    NAL-NL2 (National Acoustic Laboratories Non-Linear fitting procedure) is a widely adopted prescriptive target for optimizing speech intelligibility in hearing aid fittings.

  6. Real-ear measurement (REM) in hearing aid fitting verifies that the aid provides the prescribed gain by measuring sound at which location?

    Answer: At the level of the tympanic membrane in the ear canal

    REM uses a probe microphone placed near the tympanic membrane to measure the actual sound pressure level delivered by the hearing aid in the individual's ear.