Pure tone hearing threshold test
The hearing threshold refers to theacoustic signal that is given multiple times in the test under the specifiedconditions, and the minimum sound with more than half of the perceivedfrequency. It includes pure tone air conduction threshold test and boneconduction hearing threshold test. Through the results, you can understand thebasic conditions of hearing and the degree and type of hearing loss, and as thebasis for the diagnosis and treatment of hearing loss.
Excerpted from: "Basic And ClinicalAudiology"
Auditorybrainstem response
Auditory brain stem response (ABR) consistsof a number of waves occurring within 10 ms after the acoustic stimulation. Atotal of 7 waves are completely recorded, named after Roman numerals I~VII, themain components for I、III、V waves are the most reliable. In clinical practice, the mainmeasurement parameters of ABR include latency, threshold and amplitude. Thepeak latency and interpeak latency of ABR are useful for the localizationdiagnosis of lesions from the auditory nerve to the brainstem auditory pathway.The determination of the response threshold by V wave contributes to anobjective assessment of hearing levels.
Excerpted from: "Basic And ClinicalAudiology"
Otoacoustic emission
Otoacoustic emissions (OAE) is an audioenergy produced in the cochlea that is released into the external auditorycanal through the ossicular chain and tympanic membrane. It reflects that thecochlea not only passively feels the sound signal, but also has the function ofactively generating sound energy. Otoacoustic emissions depend on the integrityof the overall function of the cochlea and are closely related to the functionof the outer hair cells of the cochlea. Induced otoacoustic emissions can berecorded in almost all human ears with normal cochlear function.
Excerpted from: "Basic And ClinicalAudiology"
Acousticimmittance
Acoustic immittance test includestympanogram and acoustic reflex. Thetympanogram test can provide information about the function of the middle earand the eustachian tube, including whether there is effusion in the middle ear,whether the eustachian tube is unobstructed, and whether the tympanic membraneis perforated.
Excerptedfrom: "Handbook of Clinical Audiology" (5th Edition)
