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Hearing loss 2000 hertz wikipedia,long earrings and short hair ombre,tinnitus zentrum eppendorf italiener - PDF 2016

Author: admin | 26.02.2014 | Category: Tinnitus Hearing Loss

Who are our clients with hearing loss and how can we best facilitate effective communication? What are the characteristics of hearing loss and what are ways of diagnosing and treating people with hearing loss? How can vocational rehabilitation professionals appropriately prepare to serve consumers with hearing loss?
Where can people with hearing loss find current information, long-term support and tools for self-advocacy?
The case history is typically taken first and is essential to ensure the best hearing evaluation and management possible.
The first question asked of any patient is ‘Why are you here today?’ Understanding what problems the patient him- or herself may be experiencing with hearing is important and will help the audiologist with the rest of the evaluation. Does the person have trouble on the telephone, watching television, in restaurants, hearing signaling sounds such as the doorbell, smoke detector or alarm clock. Does the person have any medical conditions, such as wax build up,  bleeding from the ears, earaches, or had surgery on the ears?
Tympanometry is the name of the test used in audiology to find out how well the middle ear is transmitting sound.
Type A Tympanogram – This result indicates normal function of the eardrum and middle ear. Type B Tympanogram – Audiologists see a Type B usually when there is fluid filling up the middle ear space (red line). Type C Tympanogram – This result tells us the person’s Eustachian tube isn’t working well. There are two muscles in the middle ear, the stapedius and tensor tympani, that contract when people hear a loud sound. Audiologists measure the acoustic reflex to look at whether a person’s nerves in the reflex pathway are working correctly. The difference here, compared to regular hearing, is that the sound triggers the nerve that makes the stapedius muscle contract, so that information is traveling down to the ear from the brainstem rather than from the ear all the way to the brain.
See the gray region of the CPT Codes for those used by audiologists for tympanometry and acoustic reflex decay.
Over the last three decades, particularly since the 1980s, scientists have made many discoveries about how the cochlea works. OAEs refers to the sound that the outer hair cells in the cochlea actually sends out through the middle ear and ear canal when they are working properly. These OAE sounds are very faint, and to be detected a special machine that has a very sensitive microphone is placed into the ear canal.
Outer hair cells can echo back sounds because scientists have discovered that the outer hair cells, but not the inner hair cells, have muscle fibers inside them that cause the cells to move up and down. Functioning outer hair cells are important for hearing to occur, but they are not the same thing as ‘hearing’. There are currently two types of OAEs that are measured in audiology clinics: distortion product otoacoustic emissions (DPOAEs) and transient evoked otoacoustic emissions (TEOAEs). Picture A below is the result one gets with DPOAEs, while Picture B is the result with TEOAEs. B) The blue areas represent the emissions from various pitches in this ear while the red areas represent the noise in the room at the time of measure. When most people think about a hearing test, they typically think of pure tone testing, raising your hand when you hear some beeps. Hearing thresholds are measured at several pitches, or frequencies, given in cycles per second or Hertz: 250, 500, 1000, 2000, 3000, 4000, 6000 and 8000.
In the 1940s a couple of engineers at Bell Laboratories performed an experiment to figure out what pitches were important for understanding speech.
It is important to test hearing along these two pathways because that allows the audiologist to diagnose whether a hearing loss is conductive (the problem is in the outer or middle ear or both) or sensorineural (the problem is in the cochlea or more rarely in the nerve). Below are several audiograms to demonstrate conductive versus sensorineural hearing losses on paper.
In an audiogram, soft sounds are indicated at the top (-10, 0 dB HL, etc.) and very loud sounds at the bottom (110 or 120 dB HL). Symbols located anywhere between -10 to 25 dB HL are considered to be in the normal loudness range for adults.
Audiologists have several different ways to describe the results of pure tone testing, which can be quite confusing. A second way audiologists may talk about a hearing loss is to describe the configuration across frequencies, for example, a sloping sensorineural hearing loss or a flat conductive loss. Before going further, the field of audiology has renamed one of the speech tests that we generally give patients.
When the SRT is measured, the audiologist is looking for the softest level that a person can repeat words correctly 50 percent of the time. The QuickSIN is a set of six sentences which is played at the same time four people are talking at once; this type of noise is called “speech babble”.
Both the sentences and speech babble are presented from a speaker directly in front of the client. The sentences and babble are played through both headphones simultaneously, with one ear done then the other. However the test is administered, the result is given as a signal-to-noise ratio, which represents how much louder the speech needs to be compared to the noise for the client to correctly repeat back 50% of the sentences.
Verbal communication requires at least two individuals, and thus it’s important to involve family members and other significant communication partners in the hearing evaluation, hearing aid fitting and assistive technology assessments processes.
Geneticists generally are medical doctors while genetic counselors most often have earned master’s degrees in genetic counseling. Hearing aid dispensers are licensed in the states in which they practice, although this may vary by state, as will other requirements. The ear-nose-throat (ENT) doctor is oftentimes quite important in treatment for hearing and balance problems. Additionally, the ENT is the surgeon who will perform cochlear implant surgery as well as bone anchored implant surgery. The speech-language pathologist (SLP) has earned a master’s degree and all states require licensure to practice. In the case of adults with acquired hearing loss, SLPs will most often be called on to provide audiologic or aural rehabilitation. In terms of interacting with the audiologist, the VR counselor can be quite helpful for the client if they let the audiologist know the various pieces of information that are needed. The hearing conservation program requires employers to monitor noise exposure levels in a way that accurately identifies employees exposed to noise at or above 85 decibels (dB) averaged over 8 working hours, or an 8-hour time-weighted average (TWA). Employers must monitor all employees whose noise exposure is equivalent to or greater than a noise exposure received in 8 hours where the noise level is constantly 85 dB. The exposure measurement must include all continuous, intermittent, and impulsive noise within an 80 dB to 130 dB range and must be taken during a typical work situation. This requirement is performance-oriented because it allows employers to choose the monitoring method that best suits each individual situation. Employers must repeat monitoring whenever changes in production, process, or controls increase noise exposure. Employers must make audiometric testing available at no cost to all employees who are exposed to an action level of 85 dB or above, measured as an 8-hour TWA.
A licensed or certified audiologist, otolaryngologist, or other physician must be responsible for the program. The employee needs a referral for further testing when test results are questionable or when related medical problems are suspected. The baseline audiogram is the reference audiogram against which future audiograms are compared.
Employers must compare annual audiograms to baseline audiograms to determine whether the audiogram is valid and whether the employee has lost hearing ability or experienced a standard threshold shift (STS). Employers must show the employee how to use their hearing protection if they are showing an STS with adequate hearing protectors.
The employer must fit or refit any employee showing an STS with adequate hearing protectors, show the employee how to use them, and require the employee to wear them. Some employees with an STS may need further testing if the professional determines that their test results are questionable or if they have an ear problem thought to be caused or aggravated by wearing hearing protectors.
If subsequent audiometric tests show that the STS identified on a previous audiogram is not persistent, employees whose exposure to noise is less than a TWA of 90 dB may stop wearing hearing protectors. The employer may substitute an annual audiogram for the original baseline audiogram if the professional supervising the audiometric program determines that the employee’s STS is persistent. In addition, it is suggested that employees who are not exposed be given periodic audiograms as part of the company's health care program.
Employers should provide employees with a selection of at least one variety of hearing plug and one variety of hearing muffs. Hearing protectors must adequately reduce the noise level for each employee’s work environment. OSHA's definition of a standard threshold shift is a change, relative to baseline, of 10 dB or more in the average hearing level at 2000, 3000, and 4000 Hz in either ear.
NIOSH’s definition of significant threshold shift is a 15 dB change at any of the frequencies 500, 1000, 2000, 3000, 4000, or 6000 Hz, demonstrated on a repeat audiogram for the same ear and same frequency, with the retest being administered immediately after the audiogram that showed the shift as compared to the baseline audiogram.
Employees that receive training will be more motivated to wear hearing protection and take audiometric tests. The training program may be structured in any format, with different portions conducted by different individuals and at different times, as long as the required topics are covered.
Employers must keep noise exposure measurement records for 2 years and maintain records of audiometric test results for the duration of the affected employee’s employment. Employers are required to record work-related hearing loss cases when an employee’s hearing test shows a marked decrease in overall hearing. Managers should support the audiometric evaluation phase by allocating sufficient resources.
Management may opt to contract for audiometric services with an external source such as a mobile testing contractor or a local hearing clinic. All employees, not just those with threshold shifts, should receive prompt written summaries of their current hearing status from the professional reviewer. 1.Employers must monitor all employees whose noise exposure is equivalent to or greater than a noise exposure received in 8 hours where the noise level is constantly _____ dB. 2.Employers must provide _____ audiograms within 6 months of an employee's first exposure at or above an 8-hour TWA of 85 dB.
5.NIOSH's definition of significant threshold shift is a _____ dB change at any of the frequencies 500, 1000, 2000, 3000, 4000, or 6000 Hz, demonstrated on a repeat audiogram for the same ear and same frequency, with the retest being administered immediately after the audiogram that showed the shift as compared to the baseline audiogram.
The Transportation Safety Board of Canada (TSB) investigated this occurrence for the purpose of advancing transportation safety. On 11 August 1998, at approximately 1810 Pacific daylight time, Canadian Pacific Railway train No.

Section 3 of this report contains the Board's findings as to causes and contributing factors and other findings. 80.2 to allow an eastward train to pass, both crew members on train 463 immediately initiated emergency brake applications. On train 463, lead locomotive CP 5503 (type SD40-2) and trailing locomotive SOO 6604 sustained minor damage. The track structure consisted of continuous welded rail, laid on nine-foot hardwood ties and secured with 10 spikes per tie. The locomotive engineer and the conductor on train 463 were qualified for their respective positions and met fitness and rest standards. The locomotive engineer entered service as a trainman in 1971 and became a locomotive engineer in 1975. The Shuswap Subdivision is controlled by the Centralized Traffic Control System (CTC) as authorized by the Canadian Rail Operating Rules (CROR). CTC is a system of block signals where train movements are supervised from a central office location by a rail traffic controller (RTC). Before departing Revelstoke, the conductor on train 463 obtained a copy of the train line-up. Westward train 839 had stopped on the north track at Mile 80.2 to allow an eastward train to pass. The crew members on train 463 stated that they communicated the indication of signal 767N with each other. Train 463 passed signal 767N at approximately 1810, at which time the sun would have been approximately 20 degrees above the horizon.
Block signal 767N was checked by railway officials immediately after the accident and was functioning as intended.
CPR enforces compliance with the CROR through a monitoring program conducted at both the local and the national levels.
At the local level, railway officers ride alongside train crews, and monitor and advise crews of any observed non-compliance. This is the second rear-end collision to take place at Mile 78.0 of the Shuswap Subdivision in the last 10 years. While noise exposure is most often considered in the context of the potential for hearing loss, it can affect crew performance in other ways. Vigilance tasks and low stimulus environments which typify part of the locomotive engineer's and conductor's jobs may be considered monotonous. The TSB conducted an evaluation of speech communication among train crews to assess the impact of noise on locomotive crew communication.
The necessary voice effort for reliable communication increases with the distance between the talker and the listener and with increasing SIL. In audiometric measurements, sound levels at various frequencies are standardized against a reference zero, the nominal hearing threshold. The entrance and retention standards for running trades personnel are detailed in Canadian Transport Commission General Order No. A voluntary survey was conducted to assess the extent to which train crews are calling signals. It was identified in the survey and through TSB investigators' observations that the calling of signals is not being performed consistently.
As a result, running trade personnel may have greater hearing impairment than accounted for in the ISO standard.
Noise in the locomotive cab exacerbates the potential confusion from inconsistently called signals. The crew was exposed to a high noise environment as the train was proceeding at throttle eight and the windows were open. There were at least two opportunities for the conductor to challenge the locomotive engineer. The informal nature of train line-ups may lead train crews to develop incorrect mental models regarding their position relative to other trains. Within the current operating procedures, noise in the locomotive cab exacerbates the potential confusion from inconsistently called signals.
The effective and safe operation of a railway is largely dependent upon accurate and timely communications. This report concludes the Transportation Safety Board's investigation into this occurrence. Between one and three miles from locations where instructions from a foreman are required, as specified by Rule 311, 567.1 or 618. This is important to know because that person’s  history of and attitude toward hearing health care and amplification can have a large impact on the course of treatment. They can also see a Type B when there is a hole in the eardrum (blue line) that will be higher on the graph than the fluid. Understanding the functioning of the cochlea proved more difficult than understanding the eyes or smell, for example, because the cochlea is hard to get to, tucked inside the hardest bone in the body, the temporal bone.
However, scientists and audiologists aren’t sure right now whether these represent different ways for the cochlea to work, so they are considered to be interchangeable. The main difference between the two is that to get  DPOAEs two pure tones are played into the ear canal simultaneously to cause the echo and to measure TEOAEs the sound sent into the ear canal is a click. These results indicate normal or ‘robust’ emissions from this ear. They were interested in this question because they wanted to determine how much bandwidth they needed to put into telephone lines. The first (photo A) is regular earphones that fit either over the ears or into the ear canals (photo B). This earphone sits on the skull on the bony piece behind the ear (mastoid process) or it might be placed on the forehead.
A medical referral for individuals who have conductive hearing losses is most often made, unless that person is already under a physician’s care for the problem or they have been told by their physician that no further medical treatment is available. On an audiogram for air conduction thresholds, Xs are used to denote air thresholds for the left ear and circles for the right ear. The lower on the audiogram a symbol is located, the louder the listener needs it to be in order to detect it.
If the symbols are physically lower on the audiogram, graphed next to higher numbers on the Y-axis, that person has hearing loss.
One method is to calculate the pure tone average, which is typically the average of the air thresholds at 500 Hz, 1000 Hz and 2000 Hz. The report received from the audiologist will, most likely, state the degree of hearing loss based on the pure tone average, but this is not always done. Also included are probable characteristics for that DEGREE of hearing loss, that is, how ‘bad’ the hearing loss is, in terms of day-to-day communication. They can benefit from amplification, particularly ‘open-fit’ technology (see the Hearing Aids and Implants module for a description). Ross’ website, which displays two vastly different hearing loss configurations that will likely result in different challenges to the listener, but each ear has the same pure tone average. There are two types of speech testing that are always performed as part of a routine hearing evaluation: speech reception threshold (SRT) and word recognition in quiet. In the past we performed what was called ‘speech discrimination’ testing; now that same test is called ‘word recognition’ testing. The words used in the SRT test are 2-syllable words called spondees and are generally spoken by the audiologist.
The volume of the speech stays the same and the volume of the speech babble starts off fairly soft but gets louder as the test goes on. Research has been done for individuals with normal hearing, and those values are the standard that clients with hearing loss are compared to. They must have a graduate degree; formerly audiologists needed a master’s degree to practice and must now have a Doctor of Audiology degree (AuD). That person needs to inform the professionals about their communication needs, particular situations in which they are having problems, medical history, work history and communication needs at work, how the hearing loss is impacting their daily life, lifestyle and emotional state. It is becoming clear that most hearing losses have a genetic component, if not a complete genetic basis.
As of December 2011, 10 states require an Associate’s Degree to be a hearing aid dispenser, another 31 require a high school diploma or GED, and the remaining 9 are silent on the minimum education required.
There may be state-to-state variation in whether an audiologic evaluation performed by a hearing aid dispenser can be used by the VR Counselor except to establish eligibility. If an individual has a conductive hearing loss it is possible that surgery will improve the situation or even cure the problem, depending on its exact nature. This therapy will consist of listening to speech sounds with the hearing device, learning how the sounds may be slightly different than with no hearing loss. For example, speech in noise testing isn’t always completed by the audiologist, but that information is critical for understanding functional limitations.
These changes may mean that more employees need to be included in the program or that their hearing protectors may no longer provide adequate protection. It also provides an opportunity for employers to educate employees about their hearing and the need to protect it. The audiometric testing program follow up should indicate whether the employer’s hearing conservation program is preventing hearing loss. If additional testing is necessary or if the employer suspects a medical pathology of the ear that is caused or aggravated by wearing hearing protectors, the employer must refer the employee for a clinical audiological evaluation. Employers must provide baseline audiograms within 6 months of an employee’s first exposure at or above an 8-hour TWA of 85 dB. It is important to test workers’ hearing annually to identify deterioration in their hearing ability as early as possible. An STS is an average shift in either ear of 10 dB or more at 2,000, 3,000, and 4,000 hertz. Employers must notify employees within 21 days after the determination that their audiometric test results show an STS. If the suspected medical problem is not thought to be related to wearing hearing protection, the employer must advise the employee to see a physician.
The employer must retain the original baseline audiogram, however, for the length of the employee’s employment. The audiograms of these employees can be compared to those of the exposed employees whenever the overall effectiveness of the hearing conservation program is evaluated. Most employers use the Noise Reduction Rating (NRR) that represents the protector’s ability to reduce noise under ideal laboratory conditions. Workers who understand the reasons for the hearing conservation programs and the need to protect their hearing will be more motivated to wear their protectors and take audiometric tests. Audiometric test records must include the employee’s name and job classification, date, examiner’s name, date of the last acoustic or exhaustive calibration, measurements of the background sound pressure levels in audiometric test rooms, and the employee’s most recent noise exposure measurement.
Employers will be able to make adjustments for hearing loss caused by aging, seek the advice of a physician or licensed health-care professional to determine if the loss is work-related, and perform additional hearing tests to verify the persistence of the hearing loss. Alternatively, management may choose to purchase audiometric equipment and train a company employee to perform audiometric testing on-site under the supervision of an audiologist or a qualified physician.

Employees also should receive summaries of their hearing trends over time, along with recommendations for further evaluation or any extra precautions needed, such as more careful use of hearing protectors. 839-020 at Mile 78.0 of the Canadian Pacific Railway Shuswap Subdivision, near Notch Hill, British Columbia. Through the locomotive engineer's window, the signal first became visible at approximately 900 feet.
All times are PDT (Coordinated Universal Time (UTC) minus seven hours) unless otherwise stated.
This diagram does not take into account ambient noise levels and the impact of hearing protection.
Frequency differences in the ambient noise level can affect the distance at which effective voice communications can be made.
This question can help the audiologist establish the origin of the hearing loss, although  that cannot always be determined.
If a patient reports dizziness the audiologist will most often include a physician referral for that patient in the recommendations. Audiologists are interested in determining how easily sound travels through the middle ear to the cochlea, the end organ of hearing because that helps them figure out if someone has a hearing loss, as well as how much and what type of hearing loss they may have. Type C might also be seen in a person with upper respiratory challenges, such as someone with allergies. Some people think this reflex is there to help protect their ears from loud sounds; it may protect them a little, but in general the reflex happens too slowly to prevent that loud sound from getting to the cochlea. The process looks complicated, but basically sound travels through the system in the usual way: ear canal through the middle ear to the cochlea and up the nerves. However, one discovery that was theorized around 1948 and proven in 1978 is a phenomenon called otoacoustic emissions, or ‘OAEs’.
This entire process is ‘hearing,’ but if the cochlea isn’t working well, the information that gets to the brain cannot be comprehended.
The squares represent the measure of noise present in the room when the emissions were measured. The audiologist is seated outside the room behind an audiometer (as seen below in the photo). When considering that the frequency range of human hearing, in the absence of hearing loss, is from 20 Hz to 20,000 Hz and every frequency in between, a pure tone hearing test does not give audiologists very much information.
Using their results we can split the pitch range into 2 pieces at 1500 Hz; 35% of speech information is in the lower half, between 20-1500 Hz, and 65% of speech information is above 1500 Hz. This testing is called air conduction pure tone testing because the sound is conducted through the air into the ear canal and the middle ear to the inner ear, as in everyday life.
The tones sent to the ear through the bone conductor do not travel through the ear in the normal way. Sometimes if one ear is much worse than the other the audiologist has to send a noise (static) to the better ear to keep it busy while they are testing the worse ear. An audiologist decides whether a hearing loss is conductive or sensorineural by looking at the relationship between the air conducted and bone conducted thresholds. This value is then compared to the scale in the table below, and the degree of hearing loss is assigned according to the pure tone average. The volume increases until the final sentence, when the speech and background noise are the same volume.
This speech in noise measure is used during the counseling process to quantify how difficult it is for the client to understand speech in noise, compared to someone without hearing loss. Most states have grandfathered audiologists who have a master’s degree but not an AuD degree.
Based on test results and case history information, the audiologist may recommend that the client and the client’s family seek genetic counseling.
In contrast, the surgeon may need to operate on the 8th cranial nerve (the vestibuloacoustic nerve) and sever the nerve completely, thus wiping out hearing and balance information from that ear.
The professional in charge of the program does not have to be present when a qualified technician conducts tests. There are two types of audiograms required in the hearing conservation program: baseline and annual audiograms. This enables employers to initiate protective follow-up measures before hearing loss progresses. In an optimally effective program, the two employee groups will show essentially the same amount of audiometric change. The employer then adjusts the NRR to reflect noise reduction in the actual working environment. Tinnitus in and of itself can be problematic; however, and determining how bothersome it is for a particular patient is necessary for appropriate management.
When this situation occurs, the person can experience an earache, or otitis media, which is what many children experience, particularly in the winter months.
A Type C tympanogram may or may not have hearing loss accompanying it, but even if not, the person may feel stopped up and sound can be muffled. The audiologist plays out a series of tones and the client is told to raise their hand, say ‘yes’ or push a button whenever they hear a tone, even if the tone is very faint and they are not sure they even heard it. However, audiologists can develop an overall picture of the person’s hearing sensitivity in the various frequency ranges of low (250-500), middle (1000-3000) and high (4000-8000) pitch ranges.
This is important because most individuals with hearing loss first lose high frequency information, which can impact the understanding of speech even though it may not affect the loudness of speech. Instead, the bone conductor makes the skull vibrate and those vibrations are carried directly to the inner ear, bypassing the outer and middle ears. In those cases the symbols used change and squares are used for the left ear, triangles for the right. If the bone symbols are normal but the air symbols are poorer than 25 dB HL, that person has a conductive hearing loss. While describing a hearing loss based on a single loudness level may be convenient, it often does not capture the difficulty that listener may have in day-to-day listening situations. After, he became an audiologist and university professor spending his career educating audiologists and trying to help audiologists understand the difficulties people with hearing loss can have. During this test the volume is changed such that the person will clearly hear some of the words but will not be able to understand others when they are very soft, which is normal. Best audiology practices say that this list of words should be presented from a recording, although that may not occur in every clinic. In recognition of this fact, many audiologists are now using some kind of speech in noise testing to supplement the basic evaluation, particularly for individuals who will be fit with hearing aids. Another use is after hearing aid fitting to document improved speech understanding in noise when listening in a noisy background. Whether the individual and family pursue the counseling option is, of course, a private decision.
A brief overview, by state, of various regulations for hearing aid dispensers may be found here. The reader is referred to the How section of this training for more in-depth information about all the help a VR counselor can provide. Requesting these specific types of information will help audiologists understand the information VR counselors need to best help the client. In these instances, baseline audiograms must be completed within 1 year after an employee’s first exposure to workplace noise at or above a TWA of 85 dB.
The professional also may decide to revise the baseline audiogram if the employee’s hearing improves. The choice depends upon economic considerations as well as the size, policies, and geographical location of the company. Otitis media often leads to reduced sound transmission through the middle ear, resulting in temporary hearing loss that resolves when the fluid drains out. As with most Type B tympanograms the hearing loss is temporary and hearing returns to normal when the underlying medical condition clears up. The softest sound that a person responds to at least 50 percent of the time is called the pure tone threshold. These divisions of frequency have served us well and will continue to do so because the low pitches are where much of the energy of the vowel sounds is and also energy in noises (such as air conditioners, groups of people talking).
People with low frequency loss complain that speech is too soft, but they often can understand the speech better than individuals with a high frequency loss.
The result of word recognition testing is the percentage the individual repeated correctly.
Both of these certifications as well as most state licensure agencies require continuing education credits for audiologists.
Often, the outcome of a genetic evaluation will have little impact on audiologic care, unless a condition is identified in which it is suspected that the hearing loss will worsen over time.
Employees, however, must be fitted with, issued, and required to wear hearing protectors whenever they are exposed to noise levels above a TWA of 85 dB for any period exceeding 6 months after their first exposure until the baseline audiogram is conducted.
This will ensure that the baseline reflects actual hearing thresholds to the extent possible.
If contract services are used, it is critically important that management still assign responsibility for overseeing the hearing conservation program to a key on-site individual. If all the symbols are located close together on the audiogram and are poorer than 25 dB HL, that person has a sensorineural hearing loss. A second function of the SRT is as a comparison to the results of pure tone testing; the pure tone average and the SRT should agree within 5-10 dB.
Most audiologists will count a word as incorrect if the person misses even one sound in the word. In this situation, foreknowledge of that possibility would allow for future planning to manage the hearing loss appropriately. Employees should not be exposed to workplace noise for 14 hours before the baseline test or wear hearing protectors during this time period. Instead, the bone conductor makes the skull vibrate and those vibrations are carried directly to the inner ear, by passing the outer and middle ears. However, it is possible that a person has this gap with the bone thresholds poorer than 25 dB HL and the air thresholds even poorer.
For the most part audiologists will present 25 words to each ear, so the score listed will reflect the fact that each word is worth 4 percent of the total presented. This is called a mixed hearing loss and has a portion that is conductive and a portion that is sensorineural.

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