SHS 311 Exam Questions and Answers With Verified Solutions 2025
the cochlear microphonic has the same () as the input sound waveform - ✔✔frequency
most afferent auditory nerve fibers innervate the - ✔✔inner hair cells
during the depolarization phase of an action potential, which channel opens? - ✔✔NA+ channel
what is spontaneous response - ✔✔neural response in the absence of sound
which is not a feature of the neural tuning curve - ✔✔compressive nonlinearity
what is an auditory nerve fiber's characteristic frequency? - ✔✔the frequency at the trough of the
tuning curve
in the PST histogram, which response rate is the highest? - ✔✔onset response
neurons fire/do not fire at a particular phase of stimulus but the may/may not fire in each stimulus cycle
- ✔✔fire/may not
if an ISI histogram has peaks at 4, 8, 12, and 16 msec, what is the likely frequency of the sound? -
✔✔250 Hz
what is the limitation of rate code of intensity? - ✔✔limited dynamic range
which frequency is unlikely to produce auditory nerve responses that follow the temporal pattern of
sound waveform - ✔✔10000 Hz
where is auditory cortex located? - ✔✔temporal lobe
, what does fMRI directly measure? - ✔✔oxygenated blood flows
which part of the superior olivary complex is used to process the ITD cues? - ✔✔medial superior olive
lateral inhibitory network is used to process? - ✔✔spectral contrast
How is an action potential generated? - ✔✔-when the input stimulus is higher than the threshold, the
sodium channels open and move into the cell, increasing the potential (depolarization), when the
potential increases to a certain level, the sodium channel closes and the potassium channels open,
potassium moving out of the cells which decreases potential (repolarization) until potential is lower than
resting potential. both sodium and potassium channels will close, sodium potassium pump then starts to
work to redistribute until potential is back to resting potential (refractory period). Cell can not generate
action potentials until after refractory period which is about 1 ms, meaning the rate at which action
potentials can be generated is maximally 1000 times/sec
resting potential - ✔✔is a constant potential that exists between Endolymph and Perilymph even
without stimulation
summating potential - ✔✔the change in constant potential during acoustic stimulation
-can go up or down
-beginning of high frequency stimulus
-source is unknown
auditory action potential - ✔✔the summed response of near-simultaneous discharge of basal AN fibers
at the beginning of a high-frequency stimulus
-N1 and N2 are major negative peaks in the AP response
cochlear microphonic - ✔✔the time-varying potential that appears during the acoustic stimulation
-same frequency of the input, depends on displacement of BM
-can be used to study the frequency specific manner of BM vibrations
-thought to be generated by the shearing motion of the hair cells
the cochlear microphonic has the same () as the input sound waveform - ✔✔frequency
most afferent auditory nerve fibers innervate the - ✔✔inner hair cells
during the depolarization phase of an action potential, which channel opens? - ✔✔NA+ channel
what is spontaneous response - ✔✔neural response in the absence of sound
which is not a feature of the neural tuning curve - ✔✔compressive nonlinearity
what is an auditory nerve fiber's characteristic frequency? - ✔✔the frequency at the trough of the
tuning curve
in the PST histogram, which response rate is the highest? - ✔✔onset response
neurons fire/do not fire at a particular phase of stimulus but the may/may not fire in each stimulus cycle
- ✔✔fire/may not
if an ISI histogram has peaks at 4, 8, 12, and 16 msec, what is the likely frequency of the sound? -
✔✔250 Hz
what is the limitation of rate code of intensity? - ✔✔limited dynamic range
which frequency is unlikely to produce auditory nerve responses that follow the temporal pattern of
sound waveform - ✔✔10000 Hz
where is auditory cortex located? - ✔✔temporal lobe
, what does fMRI directly measure? - ✔✔oxygenated blood flows
which part of the superior olivary complex is used to process the ITD cues? - ✔✔medial superior olive
lateral inhibitory network is used to process? - ✔✔spectral contrast
How is an action potential generated? - ✔✔-when the input stimulus is higher than the threshold, the
sodium channels open and move into the cell, increasing the potential (depolarization), when the
potential increases to a certain level, the sodium channel closes and the potassium channels open,
potassium moving out of the cells which decreases potential (repolarization) until potential is lower than
resting potential. both sodium and potassium channels will close, sodium potassium pump then starts to
work to redistribute until potential is back to resting potential (refractory period). Cell can not generate
action potentials until after refractory period which is about 1 ms, meaning the rate at which action
potentials can be generated is maximally 1000 times/sec
resting potential - ✔✔is a constant potential that exists between Endolymph and Perilymph even
without stimulation
summating potential - ✔✔the change in constant potential during acoustic stimulation
-can go up or down
-beginning of high frequency stimulus
-source is unknown
auditory action potential - ✔✔the summed response of near-simultaneous discharge of basal AN fibers
at the beginning of a high-frequency stimulus
-N1 and N2 are major negative peaks in the AP response
cochlear microphonic - ✔✔the time-varying potential that appears during the acoustic stimulation
-same frequency of the input, depends on displacement of BM
-can be used to study the frequency specific manner of BM vibrations
-thought to be generated by the shearing motion of the hair cells
