Introduction to Hearing Loss

Introduction to Hearing Loss
Anatomy and Physiology of Hearing
Conductive Hearing Loss
Sensorineural Hearing Loss
Sudden Sensorineural Hearing Loss
Other Types of Hearing Loss

Table of Contents

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Loss of hearing occurs as a result of an auditory disorder



Type of hearing loss

  • Conductive hearing loss
  • Sensorineural hearing loss
  • Mixed hearing loss
  • Functional hearing loss
  • Central hearing loss




Sensory Neural

1. Site

Outer or middle ear.
Inner ear or cochlea and the nerve pathways to auditory centres in the brain.

2. Deafness because

Vibrations do not reach the inner ear or arrive there attenuated.
Vibrations are not registered by nerve cells in the inner ear because they are damaged, or have never developed.

3. Reasons for deafness

Outer ear - obstruction such as impacted ear wax.

Middle ear - vibration of the eardrum or middle ear bones is interrupted by: fluid build up in the middle ear, ear infections, or breakage in the ossicular chain

1. Heredity (or genetic factors)
2. Rubella or German measles.
3. Diseases of perinatal period.
4. Diseases of later childhood, for
example, meningitis.
5. Noise induced hearing loss.

4. Amenable to treatment

Medical and surgical procedures can be effective.
There is not a cure for sensory neural hearing loss, however a cochlear implant may be an option for a deaf person.

5. Characteristics of hearing loss


Loss for low and high pitch sounds is similar. Usually a mild to moderate degree of hearing loss.
Usually the loss of hearing for high pitches is greater - often much greater than for low pitch sounds. Hearing loss can range from mild to profound.

6. How speech is heard

Muffling in the perception of speech. Usually there is minimal distortion in the perception of the speech signal. Hearing aids sound very clear.
Distortion in the perception of speech. Vowels may be heard relatively well; consonants are often distorted, if heard at all. Hearing aids sound somewhat distorted, but are necessary.


Summarized By Thirayost Nimmanon

โดย ธีรยสถ์ นิมมานนท์


[Introduction to Hearing Loss] [Anatomy and Physiology of Hearing] [Audiology] [Conductive Hearing Loss] [Sensorineural Hearing Loss] [Sudden Sensorineural Hearing Loss] [Other Types of Hearing Loss] [Reference]

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