What are the otoacoustic emissions?
otoacoustic emissions are sounds that come from the inside of the ear. Scientists assumed that such emissions had occurred since the early 20th century, but did not confirm until the 70s, when scientists finally had sufficiently sensitive equipment to register otocoustic emissions. In addition to the general interest, there are also clinical importance, as it can be used to assess the health of the ear. Spontaneous emissions occur in the absence of an external stimulus, while the induced emissions are generated in response to sound. The evoked emissions can be triggered by short tones and explosions found in transient emissions generated in response to permanent tones in permanent frequency emissions, or arise in response to two conflict tones in distortion emissions. Ototacoustic emissions occur when the hair in Kochlea, which is designed to strengthen the sound, vibrate and generate a brand new sound. Some people with impaired hearing may be otoacoustic emissions muted, missing or distortedbecause their cochlets do not work as it would normally. Using the microphone, it is possible to pick up and amplify these sounds to hear.
When testing otoacoustic emissions, the probe is placed in the outer ear to listen to emissions. The extremely sensitive probe works most effectively when the room is absolutely quiet, with testing lasting about 15 minutes, although if the subject of testing is very young, the procedure may be a little more complicated. This testing is used to check the possible hearing loss in infants who cannot participate in hearing tests that require a voluntary response of the FEED subject and can also be used to assess the seriousness of hearing or loss damage in adults.
For this type of medical test there is not much preparation and the test is not painful, although the ear in the ear can feel strange. While a study participant can be able to hear different tones or sounds, they mayat. The doctor uses the test data to determine whether the hair cells work properly. Many things may affect the results of the test of otoacoustic emissions, so if the results seem to indicate hearing damage, the doctor may recommend repetition of the test and other diagnostic testing.