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Influence of ear canal occlusion and static pressure difference on bone conduction thresholds: Implications for mechanisms of bone conduction |
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| Authors: | Hashir Aazh Brian Moore Ali Asghar Peyvandi Stefan Stenfelt |
| Affiliation: | 1. Audiology Department, Earling Hospital, London, UKhashir@ealingpct.nhs.uk;3. Department of Experimental Psychology, Cambridge University, Cambridge, UK;4. Audiology Department, Earling Hospital, London, UK;5. Department of Signals and Systems, Chalmers University of Technology, G?teborg, Sweden |
| Abstract: | The effect of air pressure change on bone conduction (BC) hearing thresholds in the occluded ear was investigated. The pump manometer system of an impedance bridge was used to change the air pressure in the ear canal of twenty-two normally hearing subjects. BC thresholds were measured with: (1) open ear; (2) the ear canal occluded with a probe tube and application of 0 daPa air pressure; and (3) the ear canal occluded with a probe tube and application of ?350 daPa air pressure. Thresholds were lower in condition 2 than in condition 1, the difference decreasing from 27 dB at 2500 Hz to 4.5 dB at 2000 Hz. Thresholds were higher in condition 3 than in condition 2. The results are interpreted in terms of changes in the relative contribution of the three routes of transmission for BC sound produced by occlusion and by a static pressure difference. |
| Keywords: | Occlusion effect Stiffness changes Air pressure changes Bone conduction hearing thresholds Middle ear |