IHS Exam

In general, mold modifications are as follows:

Venting affects lows, damping the midrange and horn effects boost highs.

Basic verification involves:

checking MCL and UCL in quiet and noise.

Sound field is

a controlled environment

The configuration and height of the tympanogram can be a factor in deciding the proper matrix for the fitting of a hearing aid:

A high Type A tells us to decrease the output by 2-3 dB

You cannot use feedback checks when

checking the telephone coil

Verification procedures:

Check the accuracy of your fitting.

The problems produced by excessive ambient noise are

greater for the lower frequencies than the higher frequencies

The decibel is

a ratio between two intensities

REUR measurement are taken in

an open human ear canal

When a hearing aid is dead, you can check the receiver and microphone function by:

turning on the instrument telecoil

The dividing line between the external and middle ear is the

tympanic membrane

The cochlea, acting as a frequency analyzer, distributes acoustic stimuli to places along the basilar membrane according to frequency. This forms the basis of a hypothesis called the:

Place Theory

An organic disorder is when there is damage to:

The hearing mechanism, the neural pathways and the brain.

The speed of sound in air, in feet per second, is :

1100

Properly selected hearing instruments should allow:

The patient to wear an instrument at a comfortable loudness level, improved communication and have better hearing aided.

Crystal microphones and receivers:

are very fragile

Which of the following is not a coupler used for measuring hearing aid performance?

Zwisks Ear Simulator

Small diameter tubing of SIA hearing aids has the effect of :

reducing the high frequency gain

The function of a microphone is to :

convert acoustic energy into electrical energy

Vent an earmold :

is the most common modification made on an earmold

When a new hearing instrument has feedback at the patients comfortable level, the problem is usually:

too much wax in the ear canal

With SIE-S hearing aids:

The only signal is from the hearing aid and phrase effects from a vent are not an issue.

The most comfortable level is:

About 45 dB HL or 65 dB SPL for normal ears

Any complex sound can be broken down into individual frequencies by a technique known as:

Fourier Spectral analysis

The adult ear canal:

rises upward and forward, then descends to the drum.

An effective verification is:

a measure able improvement in communication

Which of the following is not included in correct test protocols?

plugging the hearing aid vent to control feedback

Most conducive losses:

Are medically correctable, display a breakdown or obstruction in middle ear and display good discrimination

The T position on a hearing aid switch can be used to

amplify a telephone conversation, couple hearing aid into a loop inductor, couple directly into the audio of a radio or tv

The following components can change or modify the frequency response of a hearing instrument:

a microphone

Afferent fibers:

transmit from the cochlea to the brain.

User satisfaction must include:

patient preferences

The following measurements use SPL as a reference:

Probe microphones, sound field aided thresholds, and ANSI specifications

Speech discrimination tests:

approximate a sample of speech sounds in an ordinary conversation.

A formant is:

a frequency region within a complex tone where certain harmonics have relatively large energy.

Malingering is a category of :

non organic loss

Bone conduction threshold worse than air conduction thresholds may be caused by :

poor placement of vibrator, skull fracture, thickness of skull

Part of the basic law of electrical energy is :

protons attract electrons

Some patients with binaural amplification can experience:

degredation effect

The scala tympani is filled with:

perilymph

The following is a transducer:

electret microphone

A sensorineural hearing loss is due to a disorder in the:

Inner ear

In pure tone testing, threshold means :

the lowest intensity the client hears 50% of the time.

The ear, due to its physical characteristics, enhances which frequencies?

2,000 - 5,000hz

When performing aided sound field testing, what degree of angle (from the patient/client) is the speaker to be placed?

45

Rather than asking a patient/client, "How does that sound?," which test can a hearing healthcare professional use to measure the change in a patient's/client's hearing?

APHAB

A hearing healthcare professional completes a fitting of new open-fit technology for a patient/client.

Which outcome measurement tool should the hearing healthcare professional use to determine proper fit?

Real ear measurement

Which validation method can be effectively performed in a sound field environment?

NU 6

Which procedure ensures that the patient's/client's perceived amplification needs have been addressed?

sound field measurement

What does live speech mapping measure?

gain of hearing aid

Sound field measurement provides which benefit over real ear measurement?

Increased interaction with patient/client

Real ear measurement provides which benefit over sound field measurement?

It is ear specific

When should the "with hearing aid" portion of the APHAB be administered?

two weeks after delivery

A patient/client expresses concern that they may not be receiving significant benefit from new hearing instruments.

Which two assessment tools would allow the hearing healthcare professional to validate the improvement provided by the instruments?

COSI

What is the hearing level of 105dB SPL?

85 dB HL

A hearing healthcare professional is verifying fit and performing a sound-field uncomfortable listening level check.

At which level should the hearing healthcare professional set the volume of the hearing instrument?

at the highest level allowed without acoustic feedback

A hearing healthcare professional changes the prescriptive formula while performing a real ear measurement.

What will change as a result of the hearing healthcare professional's action?

Target curve

A patient/client with moderate presbycusis has been using amplification for six months. The patient/client reports that noise is very clear, but people's voices in crowds are indistinct. A hearing healthcare professional verifies the fitting using speech mapping equipment.

Which information should the hearing healthcare professional expect to discover regarding gain targets?

low frequency gain on target with high frequency gain below target

Which type of assessment requires the comparison of aided and unaided speech recognition?

validation

Validation methods for hearing instrument fittings often utilize a patient questionnaire. What comparison method is standardly used?

aided vs. unaided

Which measure should be included in the verification process in order to reduce the likelihood of hearing instrument rejection?

Loudness discomfort testing

Which two measurements are essential when validating a fitting using compression instruments?

Most comfortable levels

APHAB

Abbreviated Profile of Hearing Aid Benefit

One of the following does not apply to SIE-O fitted hearing aids:

phase issues are eliminated

When a hearing aid sounds weak, hollow, distorted, or intermittent, the first check is:

a weak battery

The range between threshold and MCL:

differs at each frequency

The deeper microphone placement offers what advantage:

natural high frequency emphasis between 2700 and 4000 hz

When patients have a sensorineural loss, MCL:

retains a relationship with the lower boundary

Semi conductors act like a conductor with the application:

heat, light, or an electric field

What is the meaning of 40 dB threshold re: audiometric zero, at 500hz?

subject could barely hear a 500 hz tone at 40 dB about 50% of the time

With CIC fittings, which of the following frequency modifications should be made?

less high frequency amplification should be provided due to the deeper microphone placement

The following is not a transducer:

volume control

PTA describes the following audiogram classification fairly accurately:

flat loss

A sensorineural component is the difference between:

BC thresholds and the range of normal hearing

The quality or timbre of a sound that depends on :

how many frequencies are in a complex sound, the relative strength of each frequency and the resonance of the sound cavities.

Slope of loss can determine a successful fitting. A most favorable slope is :

flat or gradually falling

A symptom of recruitment is :

Intolerance for loud sounds

An otoscopic inspection should reveal:

a view of the pearly white tympanic membrane

The descending technique in pure tone audiometry is preferred because it :

is easier to hear when a sound stops than when it begins.

Routine hearing testing should be performed:

in a sound controlled room

The patient has pure tone air conduction thresholds of 40 dB HL at each frequency. If the patient has a conductive loss, his MCL would be approximately :

80 dB HL

In a complex sound, the fundamental frequency is the :

loudest frequency

In a cross section of the cochlea, the minimum number of hair cells you can see is:

4

Most patients use enough gain in the hearing instrument to understand quiet speech at a level of

55 dB SPL

Calculating prescriptive formulas are compared to :

specification sheets

Vowels differ from consonants in that they:

use more open vocal cord voicing

Individuals with a noise induced hearing impairment can have a V notch at which frequencies?

3000 Hz, 4000 Hz, and 6000 Hz

Which surgical technique repairs the tympanic membrane?

myringoplasty

Wearable instruments were a result of:

the miniature vacuum tube

The first commercially available digital processing hearing instrument:

included a body worn electronic processor.

We recognize the different vowel sounds because of vibrations in:

timbre

A masking dilemma occurs when:

It is impossible to mask, the patient displays a bilateral conductive loss, masking cannot be completed due to over masking

The greatest deciding factors in material selection for an ear mold are:

power requirements

Desk and suitcased sized hearing instruments popular in the 1920's, had more gain and clarity because of:

vacuum tube amplifiers

Most dysfunctions of the outer or middle ear cause :

a conductive loss

Which of the following terms in not part of the tympanic membrane?

Crus

A pure conductive loss shows:

All bone thresholds within normal limits

The number of bits impact the :

dynamic range of the hearing instrument

Our quest of improving speech understanding begins by studying :

speech production

Effective masking may be described as :

increased masking noise that does not shift the threshold tone, formula method to determine how much masking is needed and psychoacoustic method proposed by Hood