Exam 3 Flashcards
We test SRS ___ db above SRT
30
What does SRS stand for?
Speech recognition score
What is an example of an SRS?
“say the word __” and the person repeats the word
As long as _____ Hz is normal, even hear loss drops significantly afterwards people will still have good speech understanding
2000
How many turns does the cochlea make?
2.5
Where is the organ of Corti found?
Scala media
Responsible for the transduction of energy
Organ of Corti
Refers to the movement of the scala media
Traveling wave
Where are high frequencies displaced in the cochlea?
Base
Where are low frequencies displaced in the cochlea?
Apex
When do the stereocilia get bent?
Organ of Corti and tectorial membrane rub against each other
Where are the longer stereocilia embedded in ?
Tectorial membrane
What is an example of passive action in the cochlea?
Earplugs
Source of power to cancel noise
Active action
What is an example of active action?
Noise canceling earplugs
Fluid wave is formed as sound is passing through the basilar membrane
Traveling wave theory
What is the base of the basilar membrane like?
Narrow, thin, stiff
What is the apex of the basilar membrane like?
Wide, thick, loose
What does the base of the basilar membrane do to resonant frequency?
Increases
What does the apex of the basilar membrane do to resonant frequency?
Decreases
What type of hair cells are responsible for cochlear amplification and fine tuning of sound?
Outer hair cells
Hair cells that transfer sounds to the brain
Inner hair cells
Hair cells that elongate and get shorter when sound source enters
Outer hair cells
What is included in the active system of the cochlea (2)?
Outer hairs elongating and shortening, stereocilia creates a more robust movement
What 2 phases cause the fine tuning of sound?
Inhibitory and excitatory
Why were Bekesy’s traveling waves partially wrong?
Measurements were at high levels (no active mechanism was tested)
What is the actual traveling wave?
Cochlear amplifier at low stimulus levels near threshold
What types of sounds only use the passive system?
Loud
What types of sounds only have fine tuning?
Softer
Any sound that is produced by the cochlea and can be recorded in the ear canal
Otoacoustic emissions
