Lecture 20 - Hearing 3

Question 1

Cochlear nulceus function?

Answer 1

DCN, PVCN and AVCN; relay info, somatosensory integration, tonotopical organisation

Question 2

Superior olivary complex function?

Answer 2

binaural integration, sound localisation speech detection

Question 3

Inferior colliculus function?

Answer 3

relay station, somatosensory input (incl. vision), ipsilateral innervation to auditory cortex via thalamus

Question 4

Tonotopicity in auditory processing?

Answer 4

preserved at every level, high plasticity, decreased w hearing loss, restored w cochlear implant

Question 5

Binaural hearing?

Answer 5

dominates at levels above cochlear nucleus; sound localisation and complex tasks such as understanding speech in noise

Question 6

Cochlear nuclei splitting in function?

Answer 6

dorsal cochlear nucleus projects to midbrain, ventral cochlear nucleus (p and a) projects to superior olivary complex (sound localisation)

Question 7

Physiological response of cortex from SOC?

Answer 7

both ears> contralateral > ipsilateral; more sensitive to differences in intensity between ears

Question 8

Coincidence detector?

Answer 8

ipsilateral nerual processing initiates at cohclear nucleus and travels along axon faster than contralateral, both impulses reach leaning contralateral side SOC at same time to generate AP