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Hearing Aid Essentials: Verification

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1.  What is a compression kneepoint? The threshold of compression activation The threshold of discomfort The degree to which gain is reduced in non-linear amplification The degree to which gain is increased in non-linear amplification

2.  Which of the following is a significant change from NAL-NL1 to NAL-NL2? Less compression Correction for bilateral fitting (~3 dB less gain) Etiology is considered (more gain for acquired losses) Separate targets for noise and for quiet

3.  In general, what is the relationship between the preferred listening levels of children and adults? Children prefer a higher listening level than all adults Adult and children prefer the same listening level Only experienced hearing aid users prefer a higher listening level than children Only new hearing aid users prefer a higher listening level than children

4.  One method to assure fairly accurate probe-tube placement is to use a marker on the tube (around 28-30 mm from the tip), and then align the marker with: the opening of the ear canal the inter-tragal notch the outer rim of the concha the reference microphone

5.  A common clinical use of the REUR is: to predict hearing aid output to calculate insertion gain to determine earmold style to calculate the RECD

6.  The RECD can be used to: predict aided output when coupler output in known predict degree of occlusion effect predict the patient's uncomfortable loudness level determine effectiveness of frequency lowering

7.  The most accurate way to convert HL thresholds to SPL for my pediatric patient with hearing loss is to obtain the following: Audiogram with foam tip; RECD with personal earmold Audiogram with foam tip; RECD with foam tip Audiogram with personal earmold; RECD with personal earmold Audiogram with personal earmold; RECD with foam tip

8.  The standard RECD per ANSI 2013 is measured using which coupler? HA4 HA3 HA2 HA1

9.  Reference equivalent threshold sound pressure levels (RETSPLS) are: Average adult RECD values Standard hearing aid reference values Calibration levels for each audiometric transducer Caused by shallow probe tube insertion

10.  The most appropriate way to verify a hearing aid for an infant or young child is using: Simulated or predicted real-ear measurements Insertion gain measurements Real-ear measurements Aided Audiogram

11.  The most meaningful way to view verification results is with the: REIR REAR REAG REUR

12.  Frequency lowering technology should be verified using the following procedures: Real-ear insertion response Calibrated speech signals Live speech signals Aided detection of speech stimuli

13.  Although the commonly-understood use for the RECD is to convert hearing aid verification curves from the coupler to the real ear, the RECD is also used to: Convert HA1 to HA2 Convert HA4 to HA2 Convert REIG to REUR Convert HL to SPL

14.  In addition to coupler and coupling type, RECDs can also vary by: Hearing aid compression Test Signal Using 65 or 75 dB SPL Transducer type

15.  New data show that children and adults both have predictable differences between foamtip and earmold RECDs, including: A mid frequency peak and a high frequency notch for the earmold versus foamtip A mid frequency notch and a high frequency peak for the earmold versus foamip An overall increase in level for the foamtip versus the earmold An overall increase in level for the earmold versus the foamtip