Otoacoustic emission is by far the most accurate, safe, and painless test for the detection of defects of perception sound information. Otoacoustic issue is the main method of diagnosis of hearing loss in newborns. Simplicity and lack of discomfort during the operation valued by doctors around the world.
The essence of the method
Otoacoustic issue represents an acoustic response which reflects the normal functioning of the auditory receptor. This is an extremely weak sound waves generated by the cochlea, which may be registered in the external ear canal using a high sensitivity microphone.
These fluctuations are the result of active mechanical processes in the organ of Corti — namely, in the outer hair cells. Active movements of the past, enhanced by positive feedback, passed the basilar membrane, inducing the opposite direction traveling waves reaching the pasture plate stirrup and lead to the corresponding oscillatory process chain of auditory ossicles, eardrum and a column of air in the ear canal.
Distinguish between spontaneous and evoked otoacoustic emissions.
- Spontaneous otoacoustic emission can be incorporated in the human ear canal in the absence of sonic stimulation.
- Evoked otoacoustic emission registers in response to sound stimulation, and, in turn, is divided into several subtypes.
How is the research?
To register okusticheskoy emission in the outer auditory passage introduce the probe in the case of which there are miniature phone and microphone. If you examine evoked otoacoustic emission, theauditory passage served broadband acoustic clicks.