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Deaf and Hard of Hearing
Types of Hearing Loss
Conductive: Having to do with the outer
ear, and middle ear functions. Wax,
tympanic membrane, or the ossicles
Sensorineural Hearing Loss: Having to do
with the inner ear (cochlea)
Central Hearing Loss: NEW! Having to do
with the transmission from ear to brain
Degree of loss
 Normal 0-25dB
 Mild 26-40dB
 Moderate 41-70dB
 Severe 71-90dB
 Profound 91-110dB
A Hearing aid will
help a profound loss.
Speech Banana
The higher the frequency the higher the
 3000 Hz would be a bass violin in its lowest
500Hz would be a small girl squealing in her
highest voice
Sound Examples
Bats echo
Sample hearing Loss
Normal sloping to a severe loss in the high
frequencies. This is a bilateral loss.
Types of Amplification
Hearing Aids
Bone Conduction
Cochlear Implants
FM systems
Sign language
American Sign Language
School today I go
Sign Exact English
I go to school today
Pigeon: a series of individually made signs