1-Interaural intensity differences are best for localizing _________ frequency s
ID: 226540 • Letter: 1
Question
1-Interaural intensity differences are best for localizing _________ frequency sounds, and interaural timing differences are best for localizing ________ frequency sounds. ( Low or high)
2- Normally AVCN neurons fire action potentials at the peaks of low frequency sound waves, and the neurons respond best to a characteristic frequency. What would happen if the AVCN neurons maintained their characteristic frequency, but now fired randomly through the sound wave rather than at a specific phase?
The MSO would still be able to detect ITDs based on the identity of neurons that were active (place code)
The MSO would not be able to detect ITDs
The MSO could detect ITDs, but not as well as normally.
The LSO would still be able to detect ITDs based on the identity of neurons that were active (place code)
3-
Some vertebrates such as seals lack external ears (pinnae). Based on what we learned in class, which aspect of sound localization is most likely weakest in such animals?
azimuth estimation from spectral cues
azimuth estimation from interaural intensity differences
elevation estimation from spectral cues
elevation estimation from interaural level differences
4- An animal with a large head such as an elephant would be expected to be better able to localize sounds using interaural timing differences (ITDs) than an animal with a small head (mouse). ( true false)
5-
After depolarization, how is rapid removal of potassium from the hair cells achieved?
It is pumped out into the perilymph by the Na+/K+ ATPase pump
BK channels bind calcium and open, and these channels allow potassium to flow down its concentration gradient out of the cell
SERCA proteins pump potassium into the endoplasmic reticulum
There is no need to remove potassium, because cells are high in potassium and the relatively small amount pumped in will not affect the overall potassium concentration.
6-The dorsal acoustic stria is primarily concerned with sound localization. ( true/false)
7-
The mechanosensitive channels in hair cells are thought to be located
on the top of all stereocilia
on the top of all but the tallest row of stereocilia
throughout the hair cell
on the basal side of the hair cell
8-
The characteristic frequency of a hair cell
is the only sound frequency that the hair cell responds to.
is the sound frequency that the hair cell detects at the lowest intensity level. Other frequencies are detected at higher intensity levels.
is the sound frequency that the hair cell detects at the highest intensity level. Other frequencies are detected at lower intensity levels.
is the typical frequency at which it fires action potentials.
9-The majority of mammalian hair cells are outer hair cells, but 90% of afferent neurons in the cochlear nerve contact inner hair cells. ( True/False)
A.The MSO would still be able to detect ITDs based on the identity of neurons that were active (place code)
B.The MSO would not be able to detect ITDs
C.The MSO could detect ITDs, but not as well as normally.
D.The LSO would still be able to detect ITDs based on the identity of neurons that were active (place code)
Explanation / Answer
1. Interaural intensity differences are best for localizing _________ high.....frequency sounds..and interaural timing differences are best for localizing ________low... frequency sounds.
6. True. It participate in localization of the sound stimulus on the vertical axis.
7. The mechanosensitive channels in hair cells are thought to be located... on the top of all stereocilia.
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