Open Access Guide to Audiology and Hearing Aids for Otolaryngologists
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چکیده
An acoustic stimulus is presented to the external auditory canal; energy is transferred from the ear canal through the middle ear, some of which is reflected and some absorbed by the tympanic membrane and external ear structures. The premise behind the immittance instrumentation used to measure the acoustic reflex is the ability to accurately measure changes in reflected energy occurring from stiffening of the tympanic membrane as a result of contraction of the stapedius muscle (For the premise behind tympanometry see tympanometry chapter). The amount of reflected and absorbed energy varies depending on the admittance/impedance (flow/resistance) of energy within the system and the complex interaction between the ear structures.
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