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Related Experiment Videos

Vent configurations on subjective and objective occlusion effect.

Francis Kuk1, Denise Keenan, Chi-chuen Lau

  • 1Widex Office of Research in Clinical Amplification, Widex Hearing Aid Company, Lisle, IL 60532, USA. Fkuk@widexmail.com

Journal of the American Academy of Audiology
|March 7, 2006
PubMed
Summary

Adjusting vent diameters in completely-in-the-canal (CIC) hearing aids systematically altered the occlusion effect (OE). Researchers found a significant correlation between objective measurements and subjective user ratings of the OE.

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Area of Science:

  • Audiology
  • Hearing Aid Technology
  • Acoustics

Background:

  • The occlusion effect (OE) is a common concern for hearing aid users, impacting voice perception.
  • Variability in OE measurements can stem from factors like ear insert fit and measurement techniques.

Purpose of the Study:

  • To systematically reexamine the impact of vent diameters on both objective and subjective occlusion effect (OE).
  • To minimize variability by using advanced manufacturing and measurement techniques.

Main Methods:

  • Nine participants with high-frequency hearing loss were fitted with custom completely-in-the-canal (CIC) hearing aids manufactured using laser technology to prevent slit leakage.
  • Vent diameters were systematically altered.
  • Objective OE was measured using real-ear occluded response with frequency averaging; subjective OE was assessed by participant voice ratings.

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Main Results:

  • Systematic changes in objective OE were observed with modifications in vent diameter.
  • Subjective ratings of OE also showed systematic changes corresponding to vent diameter alterations.
  • A significant correlation was found between objective OE measurements and subjective user ratings.

Conclusions:

  • Vent diameter is a critical factor influencing the occlusion effect in CIC hearing aids.
  • Objective and subjective measures of OE are correlated, validating user perception with acoustic measurements.
  • Precise control over hearing aid acoustics, specifically vent dimensions, can optimize user experience.