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Evaluation of the sensitivity of a person's sense of hearing From Wikipedia, the free encyclopedia
A hearing test provides an evaluation of the sensitivity of a person's sense of hearing and is most often performed by an audiologist using an audiometer. An audiometer is used to determine a person's hearing sensitivity at different frequencies. There are other hearing tests as well, e.g., Weber test and Rinne test.
Prior to the hearing test, the ears of the patient are usually examined with an otoscope to make sure they are free of wax, that the eardrum is intact, the ears are not infected, and the middle ear is free of fluid (indicating middle ear infection).[citation needed]
The standard and most common type of hearing test is pure tone audiometry, which measures the air and bone conduction thresholds for each ear in a set of 8 standard frequencies from 250Hz to 8000Hz. The test is conducted in a sound booth using either a pair of foam inserts or supraural headphones connected to an external audiometer. The result of the test is an audiogram diagram which plots a person's hearing sensitivity at the tested frequencies. On an audiogram an "x" plot represents the softest threshold heard at each specific frequency in the left ear, and an "o" plot represents the softest threshold heard at each specific frequency in the right ear. There is also a high frequency version of the test which tests frequencies over 8000Hz to 16000Hz which may be employed in special circumstances.[citation needed]
The availability of stereo headphones and smartphones or tablets equipped with sound reproduction systems led to the appearance of new audiologic diagnostic methods which help people identify their degree of hearing loss without assistance. For users of these mobile devices, there are a number of applications available with a function for audiometric hearing testing. There are also hearing aid applications with a built-in hearing test for making hearing aid adjustments.
In the process of hearing test with specialized applications, initial hearing thresholds of perception of tone signals on different frequencies (audiogram) are identified.
Hearing thresholds, like with traditional audiometry, and with a special application, are determined on a standard set of frequencies from 125 Hz to 8 kHz. Also, an application can be integrated with a function for testing the relevance of perception of separate sounds and figures of intelligibility in various acoustic conditions
Technically, the hearing test application consists of the following blocks:
Hearing test results obtained through the application will be in error as compared to the results of hearing test conducted by an audiologist because of the following reasons:
Advantages of the audiometry conducted with a specialized application or hearing aid application include availability and possibility to do the hearing test without assistance.[2]
Despite possible errors in the results of diagnostics, the undoubted advantages of hearing testing with a special application or hearing aid application include the ability to do the hearing test without assistance and the availability of hearing testing.[2]
Scientists suggest that the hearing test using a mobile application can be used to identify hearing pathologies and also for hearing screening tests.[3][4]
A complete hearing evaluation involves several other tests as well.[5] In order to determine what kind of hearing loss is present, a bone conduction hearing test is administered. In this test, a vibrating tuning fork is placed behind the ear, on the mastoid process. When the patient can no longer feel/hear the vibration, the tuning fork is held in front of the ear; the patient should once more be able to hear a ringing sound. If they cannot, there is conductive hearing loss in that ear. Additionally, the tuning fork is placed on the forehead. The patient is then asked if the sound is localised in the centre of the head or whether it is louder in either ear. If there is conductive hearing loss, it is likely to be louder in the affected ear; if there is sensorineural hearing loss, it will be quieter in the affected ear. This test helps the audiologist determine whether the hearing loss is conductive (caused by problems in the outer or middle ear) or sensorineural (caused by problems in the cochlea, the sensory organ of hearing) or neural - caused by a problem in the auditory nerve or auditory pathways/cortex of the brain.
The Hearing in Noise Test (HINT) measures a person's ability to hear speech in quiet and in noise.[6] In the test, the patient is required to repeat sentences both in a quiet environment and with competing noise being presented from different directions. More specifically, there are four conditions: (1) sentences with no competing noise, (2) sentences with competing noise presented directly in front of the patient, (3) noise presented at 90° to the right of the patient, and (4) noise presented at 90° to the left of the patient. The test measures signal-to-noise ratio for the different conditions which corresponds to how loud the sentences needed to be played above the noise so that the patient can repeat them correctly 50% of the time.
The Words-in-Noise Test (WIN) uses monosyllabic words presented at seven different signal-to-noise ratios with masking noise - typically speech spectrum noise.[7] The WIN test will yield a score for a person's ability to understand speech in a noisy background. Unlike a pure-tone audiogram, the WIN test may provide a more functional test of a person's hearing in a situation that is likely to occur.[3]
The Modified Rhyme Test (MRT) is defined in the American National Standard ANSI S3.2 Methods for Measuring the Intelligibility of Speech Over Communication Systems.[8] The method consists of 50 sets of six monosyllabic words that differ in initial or final consonant (e.g. not, tot, got, pot, hot, lot or ray, raze, rate, rave, rake, race). The listener is typically presented with one of the words in the couplet preceded by a phrase, "You will mark the word ___". The six words that rhyme are presented to the listener to select what they believe to be the correct answer. The MRT has been extensively used by the US Air Force to test the performance of different communication systems, which often include a noise interference component. If a condition achieves a score of 80% correct responses or better, then that is often an acceptable performance level.[citation needed]
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