Term
Candidacy: ___ configuration is for normal or near
normal hearing in one ear & the opposite ear cannot benefit from amplification |
|
Definition
|
|
Term
CROS System – The Essentials:
-For patients with ___ loss; single-sided deafness
-Only ___ sound from one side of the head to the other
-Should not ___ sound; if it does, the disadvantages
will likely outweigh the advantages |
|
Definition
| unilateral; transfers; amplify |
|
|
Term
| What is an advantage and disadvantage of a CROS system? |
|
Definition
-Advantage: improves speech understanding in noise
(compared to unaided) when speech originates on the side of ear with significant SNHL.
-Disadvantage: decreases speech understanding when speech
originates from side with the normal hearing ear. |
|
|
Term
Considerations When Fitting CROS for SSD:
-Include the option to ___ the offside mic when it contributes to a poorer SNR
-Choose an ___ coupling system in the better hearing ear
-Consider other technology (e.g .___ ___) on the better
ear if listening in a classroom or group in noise & when talkers are positioned on the poorer side. |
|
Definition
|
|
Term
Transcranial CROS (a.k.a. Power CROS):
-Candidacy?
-Controversial fitting configuration: power instrument is fit to the ___ ear |
|
Definition
| profound unilateral SNHL; non-hearing |
|
|
Term
| How does the power CROS work? |
|
Definition
Vibrations produced on the side with poor hearing travel
via bone-conduction to the opposite side of the head (e.g. ear with normal hearing) |
|
|
Term
| What style HA is the power CROS? |
|
Definition
| Typically BTE or ITE, but some have advocated fitting CICs this way |
|
|
Term
| The BICROS system has the mic, amp, and receiver on the ___ ear (___ ear) and the mic only on the ___ ear (___ SNHL) |
|
Definition
| aidable; better; unaidable; profound |
|
|
Term
| What is the candidacy for BICROS system |
|
Definition
| -Individuals with SNHL (aidable) in one ear and significant (often profound) SNHL (unaidable) in the other ear |
|
|
Term
| What is an advantage and disadvantage of the BICROS system? |
|
Definition
-Advantage: works best if the signal of interest originates in front of listener. Signals/inputs from other azimuths reach the 2 mics out of phase; so mic outputs combine less effectively.
-Disadvantage: less clear signal by mic on “far ear” side will be added to the clearer signal from closer mic (this reduces clarity of clearer signal) |
|
|
Term
Bone-conduction Hearing Aids:
-Vibrate ___ structures without sending the sounds the typical way through the ME
-A bone conductor is the output transducer which has to be coupled to the ___ usually via a headband |
|
Definition
|
|
Term
| Why would you use a BC hearing aid? |
|
Definition
| Any malformation of the outer or middle ear, significant CHL for any reason, or SSD |
|
|
Term
Disadvantages of BC HAs:
-Transducer needs to fit ___ against the head; pressure from oscillator can cause ___ problems.
-Can easily ___
-Highly ___
-Can not measure ___
-Cable & plugs between the aid & BC transducer can be ___
-IA for BC sounds is less than for AC sounds; can pick up different signals on each side of the head, but unable to deliver them independently to the respective ___ (smaller binaural differences; but enough to localize)
-Limits of BC oscillator & attenuation from skin results in ___ LF and HF responses |
|
Definition
| snuggly; skin; dislodge; visible; output; unreliable; cochlea; reduced |
|
|
Term
| What are some advantages of a BC HA? |
|
Definition
-May provide adequate auditory input while individuals await other surgical/medical interventions
-Doesn't require surgery or anesthesia |
|
|
Term
Findings with CROS systems:
-improved speech perception in noise when the target was
presented on the ___ side |
|
Definition
|
|
