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CROS/BiCROS Fitting and Verification

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1.  CROS hearing aids are used to treat the following hearing condition Conductive hearing loss in one ear Unaidable hearing condition in one ear Tinnitus Loudness discomfort

2.  In the procedure presented, the difference between the REUR measurement and the REAR/REIG 1 measurement was: Right and left ear acoustic differences Hearing instrument gain Head shadow effects None of the above

3.  What hearing aid adjustment is required prior to conducting a CROS verification test using pink noise as the input stimulus? System calibration Listening check Battery test Turn off noise reduction

4.  For all CROS and BICROS tests, the “Test Ear” is always: The better ear The poorer ear The ear with the largest ear canal None of the above

5.  What type of audiogram entry is required prior to conducting a Real-Ear CROS verification procedure? Flat audiogram at 65dB Sloping audiogram with high frequency thresholds no greater than 70dBHL The patient’s audiogram No audiogram entry is required

6.  What target rule is required prior to conducting a Real-Ear CROS verification procedure? NAL-NL2 DSL i/o Fig. 6 None

7.  To conduct a Real-Ear verification of a CROS or BICROS system you need the following: An insertion gain analyzer Speechmap analyzer The ability to separate the reference mic from the probe mic An audiometer

8.  What is the difference between a CROS device and a BiCROS device? About $300 There is no difference The size of the hearing aid Two active hearing aid microphones rather than one

9.  What is the identified advantage of using calibrated speech as the input stimulus rather than pink noise? With speech as the input condition, it is not necessary to turn off the noise reduction feature of the hearing aid Speech is more real world, and therefore will yield a better CROS verification result Speech is more pleasant to listen to Speech can be presented at a greater variety of intensity levels

10.  What is head shadow? The shadow created by the head The impact the head has on signal level and spectrum reaching the ear nearest to the sound source The impact the head has on signal level and spectrum reaching the ear furthest from the sound source None of the above