J Am Acad Audiol 2005; 16(09): 747-762
DOI: 10.3766/jaaa.16.9.11
American Academy of Audiology. All rights reserved. (2005) American Academy of Audiology

Vent Configurations on Subjective and Objective Occlusion Effect

Francis Kuk
Denise Keenan
Chi-Chuen Lau
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07. August 2020 (online)

The current study reexamined the effect of vent diameters on objective and subjective occlusion effect (OE) while minimizing two possible sources of variability. Nine hearing-impaired participants with primarily a high-frequency hearing loss were evaluated. Laser shell-making technology was used to make ear inserts of completely-in-the-canal (CIC) hearing aids for the study. This was to minimize any potential slit leakage from the inserts. The vent dimensions were systematically altered during the study. Participants sustained /i/ for 5 sec, and the real-ear occluded response was measured with a custom-made program that performed frequency averaging to reduce response variability. Participants also repeated the phrase "Baby Jeannie is teeny tiny" and rated their own voice. The results showed a systematic change in the objective OE and subjective ratings of OE as the vent diameter was modified. Furthermore, a significant correlation was seen between subjective rating and objective occlusion effect.