Occlusion Effect
The hollow or booming quality perceived by a hearing aid wearer for their own voice, caused by blockage of the ear canal by the hearing aid or mould.
Full Definition
The occlusion effect occurs when an ear mould or in-the-ear hearing aid body blocks the ear canal, trapping bone-conducted sound energy (particularly low-frequency components of the wearer's own voice) and causing it to resonate in the sealed canal space. The result is a perception of one's own voice as hollow, booming, or echo-like. It is a significant complaint among new hearing aid users and is managed through venting, open-fit devices, or deep canal placement. Editors will encounter the term in patient counselling materials, fitting reports, and product descriptions; it should not be conflated with acoustic feedback or with the related but distinct concept of ear canal occlusion for medical purposes.
Usage
Usage note: 'Occlusion effect' is the preferred clinical term; 'barrel effect' is colloquial and best avoided in formal reports. Do not confuse with acoustic feedback.
In Context
- "The patient complained of the occlusion effect when speaking on the telephone; the clinician increased the vent diameter to provide relief." — Hearing aid follow-up appointment note
- "The patient leaflet should explain the occlusion effect in plain language without using the term 'barrel voice', which may confuse readers." — Patient information editorial review