J Am Acad Audiol 2002; 13(01): 025-037
DOI: 10.1055/s-0040-1715945
American Academy of Audiology. All rights reserved. (2002) American Academy of Audiology

Observations on the Relations among Occlusion Effect, Compliance, and Vent Size

Roberto Carle
Søren Laugesen
Claus Nielsen
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Publication Date:
07 August 2020 (online)

In a clinical experiment, it was found that there is a high correlation between the compliance measured by tympanometry and the minimum size of the earmold vent, which just solves the client's occlusion problem related to his/her own voice when using a hearing aid. For ears with sensorineural hearing losses, compliance explained 59 percent of the variation in vent size, whereas the average low-frequency hearing loss explained as little as 0.3 percent. In a laboratory experiment, the objective occlusion effect measured with the participants' own voices showed a similar relationship with compliance. Whereas the former relationship between compliance and vent size may be explained by a simple model, the latter relationship turns out to be the opposite of what a firstorder model predicts. Hence, compliance must be indicative of another aspect of the occlusion mechanism, which has a more profound influence on the observed occlusion effect than compliance itself.