– Practice Test
– Briefly define the following terms.
Resonance Theory of Hearing:
Hair cells found near the helicotrema are sensitive to low
frequency sounds, whereas hair cells found near the
stapes are sensitive to hig frequency sounds.
will result when the stria vascularis is selectively destroyed by a chemical
agent, even if the rest of the auditory system remains intact and undamaged.
of the afferent nerves have synapses on outer hair cells, while only about 5%
of the afferents have synapses on inner hair cells.
won the Nobel prize for his investigations of the motility of outer hair cells.
Although inner and outer hair cells are anatomically different, they
have very similar functions.
of the following is true: a) The basilar membrane is stiffer at the apex
than at the base, b) The width of the cochlear duct is narrowest at the
apex, c) The basilar membrane is wider at the base of the cochlea than
at the apex.
____ If we
record the time between the onset of a tone and the response of the auditory
nerve, which of the following elicits the shortest response time? a) a 7 kHz tone, b) a 1000 Hz tone, c) a 200 Hz tone, d) the response time is the same for
The mechanical response of the basilar membrane described by Bekesey does not
provide an explanation for the sharpness of frequency tuning observed at the
level of the auditory nerve.
Endolymph is found in the a) scala tympani, b) scala vestibuli, c)
scala media, d) none of the above.
____ Phase locking refers to a)
constructive interference between two sound waves, b) a localization cue
derived from the difference in arrival times of a sound at each ear, c)
the tendency for depolarizations of an auditory fiber to be temporally
distributed during one-half cycle of a sinusoidal stimulus, d) the fact
that the membrane of the round window is displaced outward whenever the stapes
is displaced inward, and vice-versa.
information can exist in two different forms, a spectral representation and a
temporal representation. In both cases,
discuss how inner ear mechanisms convert acoustic information into an internal
representation (i.e. a neural code).
2) How do inner hair cells and outer hair cells
differ with regard to their functions?
3) Describe the depolarization process of a hair
cell, starting with the bending of the cilia.