Auditory

Question 1

Middle ear

Answer 1

Typanic membrane (eardrum) Three bones; Malleus, incus and stapes. And the oval window. sound vibrates on eardrum, bones move and oval window connects to internal ear

Question 2

Internal ear

Answer 2

Conchlea (three fluid filled chambers): Basilar membrane(Lined with hairs, stereocilia movement depolarizes hair cells) Tonotopic organization and apax responds to low frequencies

Question 3

Cochlear nucleus (in medulla)

Answer 3

The auditory nerve projects form the chochlear nucleus and sends signals from hair cells to brain

Question 4

Superior olivary complex

Answer 4

Combines signals from both ears.

Question 5

Auditory cortex

Answer 5

Primary (A1) and secondary (A2). Different parts process different frequencies. Between 500 and 5000 Hz largest space because of evolutionarily importance.

Question 6

Interaural time difference

Answer 6

Frequencies below 3 kHz. Slow sound. Max is 700 ms and min is 10ms. MSO responds strongly to coincident arrivals

Question 7

Interaural intensity difference

Answer 7

Frequencies greater than 3 kHz. Acoustic shadow (obstacle for high frequencies) and intensifies difference. Stimulus in left ear causes stronger reaction from LSO.