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CD 444 Exam 2: Questions & Complete Solutions (Expert Verified)
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CD 444 Exam 2: Questions & Complete Solutions (Expert Verified)
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CD 444 Exam 2: Questions & Complete Solutions(Expert Verified)
4 Parameters to look at when diagnosing hearing loss Right Ans - -
determine unilateral or bilateral hearing loss
-degree of hearing loss
-type of hearing loss
-configuration (shape of audiogram)
Audiogram Right Ans - -anything red is right ear
-anything blue is left ear
-test 250-8,000 Hz (speech sounds)
-intensity is down the side of the graph
- >= bone conduction
- x= air conduction
Vibrotactile Response Right Ans - -frequency of bone conductor is so low it
vibrates and person responds to vibration even if the sound isnt heard
Hearing Aids Right Ans - -hearing instruments
-infants can be identified w HL and given hearing aids as young as 4 weeks old
-amplify frequencies where hearing loss occurs
-ideally
make soft sounds audible
make average sounds comfortable
make loud sounds tolerable
Hearing aid gain Right Ans - -gain is the amount by which each sound is
amplified
-ex; 50 dB going in, 95 dB comes out, 45 dB gain
Frequency Response Right Ans - -frequency response is the frequency
region amplified by hearing aid
-hearing aid amplifies only where hearing loss occurs
Dynamic range of hearing Right Ans - -person w sensorineural hearing loss
often have reduced loudness tolerance
-range of usable hearing
, -range of hearing between threshold and loudness discomfort level
Normal Dynamic Range Right Ans - -110 dB LDL- 0 dB threshold=110 dB
DR
Reduced Dynamic Range Right Ans - -95 dB LDL-55 dB threshold=40 dB
DR
How Hearing Aids Work Right Ans - -input signal is picked up by
microphone which converts it to electrical signal
-signal is amplified
-receiver converts signal to acoustic energy
-output signal is delivered into ear canal
Level of hearing instruments technology Right Ans - -analog
-digital
Analog Hearing Aid Right Ans - -traditional transistorized electronic
circuits
-no longer commonly used
Digital Hearing Aid Right Ans - -microchip technology
-programmed to each individual hearing loss
-memory
-remote controls, etc
-high end
Type of Hearing Aids Right Ans - -in-the-ear
-behind the ear
In-The-Ear Right Ans - -full shell
-in-the-canal
-completely-in-canal
Behind-The-Ear Right Ans - -traditional w earmold
-newer design w slim tube and tip or RIE (receiver in the ear)
Behind the ear w earmold Right Ans - -instrument fits behind the ear and
connects to an earmold that fits in the ear
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