الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
Otoacoustic emissions (OAEs) are sounds, usually subaudible, that can be recorded from the canal. These emissions occur in most normal hearing persons, although they can be evoked only by sound stimulus. Spontaneous emissions occur without a sound stimulus and are present nearly 50 percent of the normal hearing population. The level of OAEs can be influenced by such factors as signal characteristics, noise, age and hearing sensitivity of the subjects, probe fit, and the suppressive effects of the medial olivocochlear bundle. Most of the medial OCB fibers connects directly with the base of the outer hair cells which are the origin of OAEs. So, OAEs may provide a way to measure OCB function. The main focus of interest in this study was to examine OAEs and their relationship to the OCB.
Forty normal hearing subjects were tested for presence of TEOAEs and SOAEs without masking and then with contralateral masking.
The present research aimed to:
- To study the suppressive effect of the OCB on the transient evoked and spontaneous otoacoustic emission waveforms.
To study the effect of age on this suppressive effect.
The study revealed that there was decrease in the amplitude of TEOAEs after masking in all subjects of study.