HW 8

Cochlear Nucleus (CN) Information

Ipsilateral, Monaural

Cochlear Nucleus (CN) Function

Refine initial code delivered

from ANFs

Superior Olivary Complex (SOC) information

Ipsi+Contra, Binaural

Superior Olivary Complex (SOC) function

1st stage of binaural integration, refine localization; acoustic reflex

Lateral Lemniscus (LL) information

Ipsi+Contra, Binaural

Lateral Lemniscus (LL) function

Relay information to higher brainstem levels

Inferior Colliculus (IC) information

Ipsi+Contra, Binaural

Inferior Colliculus (IC) function

2nd stage of binaural integration, refining localization; startle reflex

Medial Geniculate Body (MGB) information

Ipsi+Contra, Binaural

Medial Geniculate Body (MGB) function

Last stage of processing before signals are routed via auditory radiations to auditory cortex

ITDs & ILDs 1st level of encoding along the brainstem

SOC

ITDs & ILDs frequencies

ITD - comparison of timing/phase between ears, most efficient for localizing low frequencies in the horizontal plane (deg azimuth)

ILD - comparison of amplitude/intensity between ears, head shadow effect, most efficient for localizing high frequencies in the horizontal plane (deg azimuth)

What are 3 differences between Type I and Type II auditory nerve fibers?

a. Type I = myelinated

b. Type I = IHCs, Type II = OHCs

c. Type I = many to 1 HC, Type II = one to many HCs