Problem:

Question 1: What are the cues that the auditory system uses to determine the location of a sound source?

a.Distortion of sound due to the shape of the pinna
b.Direction of K+ current in hair cells
c.Location of maximal vibration of the cochlear basilar membrane
d.Intensity differences in sound between each ear
e.Time differences between sound waves reaching one ear vs. the other

Question 2: Why is there efferent innervation from the central nervous system the outer hair cells?

a.This allows outer hair cells to send signals directly to the inner hair cells
b. This allows for amplification of cochlear membrane vibrations, modulated by feedback from the central nervous system
c. This allows for sound localization (determining which direction a sound is coming from) by inter-aural time difference
d.This allows for sound localization (determining which direction a sound is coming from) by inter-aural intensity difference

Provide the correct answer and justification for your choice.