English Speakers – Hearing Test 5

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English Speakers – Hearing Test 5

The key terms of Hearing Test 5 include, English Speakers.


How many English speakers in the world could possibly have APD?

300 million


Cochlear loss can be identified by

Sensitivity loss
recruitment
reduced frequency resolution
reduced supra-threshold speech recognition


Transduction

motion of stapes in oval window sets perilymph in scala vestib in motion
motion transferred to scala media
sets basilar membrane into motion
tect membrane moves at diff angle from basilar membrane causing cilia of the outer hair cells to be sheared
OHC enhances motion which MOTION shears the inner hair cell cilia
inner hair cells then sends impulse to auditory nerve
Active Process


Congenital hearing losses

Autosomal/recessive
usher
waardenburg
branchial-oto-renal


Autosomal hearing loss

Involving one of the 22 pairs of nonsex chromosomes


Recessive hearing loss

Gene has to be present on both chromosomes to be expressed and both parents usually have normal hearing


Frequency analysis

Vibratory characteristics of basilar membrane
amp depends on stimulus frequency
low freq peak near apex
high newar the base
Passive Process


Usher syndrome

Hearing loss
vestibular disturbances
vision loss


Waardenburg syndrome

SNHL
unusual pigment patterns
distinctive facial structure


Branchial-otorenal syndrom

Ear malformations
cysts in the neck
hearing loss
kidney malformations


Later causes of inner ear disorder

Infections
ototoxicity
noise
sudden hearing loss
meniere’s disease
temporal bone fracture
presbycusis


Scala vestibuli starts where and what fluid

Oval window
Perilymph


Choclea functions

Transduction
frequency analysis


How many English speakers in the world could possibly have APD?

300 million


Cochlear loss can be identified by

Sensitivity loss
recruitment
reduced frequency resolution
reduced supra-threshold speech recognition


Transduction

motion of stapes in oval window sets perilymph in scala vestib in motion
motion transferred to scala media
sets basilar membrane into motion
tect membrane moves at diff angle from basilar membrane causing cilia of the outer hair cells to be sheared
OHC enhances motion which MOTION shears the inner hair cell cilia
inner hair cells then sends impulse to auditory nerve
Active Process


Congenital hearing losses

Autosomal/recessive
usher
waardenburg
branchial-oto-renal


Autosomal hearing loss

Involving one of the 22 pairs of nonsex chromosomes


Recessive hearing loss

Gene has to be present on both chromosomes to be expressed and both parents usually have normal hearing


Frequency analysis

Vibratory characteristics of basilar membrane
amp depends on stimulus frequency
low freq peak near apex
high newar the base
Passive Process


Usher syndrome

Hearing loss
vestibular disturbances
vision loss


Waardenburg syndrome

SNHL
unusual pigment patterns
distinctive facial structure


Branchial-otorenal syndrom

Ear malformations
cysts in the neck
hearing loss
kidney malformations


Later causes of inner ear disorder

Infections
ototoxicity
noise
sudden hearing loss
meniere’s disease
temporal bone fracture
presbycusis


Scala vestibuli starts where and what fluid

Oval window
Perilymph


Choclea functions

Transduction
frequency analysis


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