The occlusion effect, characterized by an increase in loudness, particularly in low frequencies, during self-generated sounds when ears are covered, can be a common issue for hearing aid users. This sensation often arises due to the transmission of increased signals through the normal middle ear. Here are some methods to address the occlusion effect:
What is the Occlusion Effect?
The occlusion effect is the perception of heightened loudness in self-generated sounds, such as vocalization, chewing, or walking, when the ears are covered (occluded). This occurs as a result of increased signal transmission through the normal middle ear.
Populations Affected by Occlusion Effect:
Hearing-impaired individuals with low-frequency hearing below 40 dB HL:
Closing the external ear canal with a hearing aid or earmold may lead to the accumulation of low-frequency bone conduction sound energy, causing a louder, muffled, and echoic sound.
Users of customized hearing aids or behind-the-ear devices with customized earmolds:
Closed cavities formed by these devices can increase the build-up of low-frequency sound energy, contributing to the occlusion effect.
Those who wear headphones, earplugs, etc.:
Headphones and earbuds obstruct the external ear canal, impeding the emission of low-frequency sound energy, resulting in the occlusion effect.
Methods to Solve the Occlusion Effect:
1. Adjust Hearing Aid Parameters:
Seek professional help to readjust hearing aid parameters, specifically reducing the volume of low frequencies without compromising overall hearing. Gradual adaptation is essential.
2. Replace Sound Guide Tube or Earbuds:
For behind-the-ear hearing aid users, consider trying thinner acoustic tubes and open-end or semi-open-end porous earbuds to reduce sound energy and alleviate the occlusion effect.
3. Open Air Holes or Extend Earmold:
For users with customized hearing aids or earmolds, opening air holes or extending the length of the hearing aid or earmold can help release low-frequency energy and reduce the occlusion effect.
4. Wear RIC Hearing Aids:
Receiver-in-Canal (RIC) hearing aids, placing the receiver inside the ear canal, can effectively address the occlusion effect. These devices use porous and soft-textured earbuds to dissipate low-frequency energy, providing a more natural and comfortable experience.
Note: Individuals with recurrent otitis media should avoid RIC hearing aids due to the risk of damage by ear secretions.
In conclusion, while the occlusion effect is a common phenomenon, these methods aim to provide users with a more comfortable hearing experience by addressing the specific challenges associated with the occlusion effect.
Post time: Nov-30-2023