الفهرس Only 14 pages are availabe for public view
 |  | from | 170 |  |  |
| | | from | 170 | | |
Abstract
cochlear hearing loss is often associated with damage to the hair cells. sometimes the hair cells at certain places may be non functioning or missing which means there is no transduction of basilar membrane vibration at these places. In addition the auditory neurons in certain places may be non functioning or degenerated or missing which means that information about basilar membrane vibration at these places is not transmitted to the brain . This is referred to as Dead Regions. This study was designed to study the effect of amplification of dead regions on speech intelligibility .It was carried out on 25 ears with moderate to moderately severe sensorineural hearing loss with positive Threshold equalizing noised test (TEN ) test criteria.Equipments used in this study were two channel audiometer . Immittancemeter , sound treated room Compact disc containing TEN TEST . Casette tape recorder for Arabic speech in noise test, compact disc for consonant recognition test. All subjects were submitted to full history taking basic audiological evaluation, TEn test for each ear, unaided and aided arabic speech in noise tests and consonant recognition test. It was found that applying full gain amplification at frequencies lying well inside dead regions was significantly worse than reducing gain by 50 % or 100 %. Also it was found that their scores in noise were worse than their scores in quiet.