Cochlear amplifier

Question 1

What are otoacoustic emissions?

Answer 1

echoes of the sound going into the cochlea

Question 2

Where are otoacostic emissions found and where can they be recorded?

Answer 2

the external ear canal

Question 3

What do otoacoustic emissions come from?

Answer 3

outer hair cells

Question 4

Outer hair cells contract and expand (electromotility) to provide a boost to the basilar membrane. Outer hair cells ________ when the BM moves up and __________ when the BM moves down

Answer 4

contract; elongate

Question 5

where does the electromotility of outer hair cells happen when boosting the BM

Answer 5

apex

Question 6

The electromotility of OHC allows for something called

Answer 6

the cochlear amplifier

Question 7

What is the cochlear amplifer

Answer 7

allows us to hear 3-5 Hz frequency changes and allows for very specific frequency tuning

Question 8

How does the cochlea encode frequency?

Answer 8

When acoustic frequencies enter the ear canal they vibrate the TM and osscicles

Question 9

Give an example of how the cochlea encodes frequency.

Answer 9

if it is 1000 Hz the Tm and ossicles vobrate a 100 times per second; therefore the stapes footplate is pushing in and out of the oval windiow 1000 times per second

Question 10

What does frequency encoding do?

Answer 10

creates the traveling wave in the cochlear duct and moves the basilar membrane