Lecture 14: auditory physiology

Question 1

Pinna

Answer 1

proper terminology for cartilage outside of head

Question 2

two features of the pinna

Answer 2

gather sound waves and channels them through the ear

Question 3

Bones in the middle ear and what do they do?

Answer 3

collectively known as the middle ear ossicles: incus, mealleus and stapes hlep getting sound outside in the air into the fluid in the inner ear

Question 4

What happens in the cochlea?

Answer 4

turns wave frequencies into action potentials

Question 5

Cochlear at cellular level: hair cells innovated by nerves…

Answer 5

• inner hair cells - afferent nerves (send info from ear to brain)
• outer hair cells - efferent nerves (receiving info and acting on it)

Question 6

Reserach: outer hair cells

Answer 6

Responds to different frequencies more so than others (suggesting it is tuned to specific frequencies)

Question 7

Positive feedback amplification

Answer 7

sound comes into basilar membrane, ICH voltage change (which sends to auditory nerve) but also OCH voltage change influencing OCH length chnage which then sends more info to ICH voltage change and nerve

Question 8

Phase locking

Answer 8

Inner hair cells stimulate phase locked action potentials on auditory nerve