SHS 311 Exam 2024 Questions with Complete Solutions
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Course
SHS 311
Institution
SHS 311
SHS 311 Exam 2024 Questions with Complete Solutions
What are the basic characteristics of an auditory nerve fiber tuning curve? - Answer- -tuning curve has a steep high frequency roll off
-shallow frequency tail
-the lowest sound level required=the frequency at the trough is the CF
What is ...
SHS 311 Exam 2024 Questions
with Complete Solutions
What are the basic characteristics of an auditory nerve fiber tuning curve? - Answer- -
tuning curve has a steep high frequency roll off
-shallow frequency tail
-the lowest sound level required=the frequency at the trough is the CF
What is and how is a PST histogram measured? - Answer- -post-stimulus time
histogram is the distribution of neural response over time
-record the neural spike chain for the same input sound and same auditory neuron and
count the number of neural spikes in the same time window
What is and how is an ISI histogram measured? How to decide the stimulation
frequency based on the ISI histogram? - Answer- -the distribution of the time intervals
between adjacent spikes
-count the number of occurrence of each time interval between adjacent neural spikes
-typically the time interval corresponding to the first peak is equal to the period of the
input sound due to phase-locking phenomenon
-find out the time interval of the first and highest peak; calculate its reciprocal to get the
input sound frequency
What are the three main peripheral auditory codes and their limitations? - Answer- -rate
code for intensity; has a limited dynamic range
-synchrony code for phase and timing info; only works for frequencies below 5000 Hz
-place code for frequency; multiple neurons respond to the same frequency so there is
limited frequency resolution
What are the four lobes of the cerebral cortex - Answer- frontal, parietal, occipital,
temporal
Where is the auditory cortex located - Answer- temporal lobe
What are the main nuclei (centers) for processing ITD and ILD information of sounds? -
Answer- -ILD cues are processed by the lateral superior olive by which the bipolar cells
have excitatory input from the ipsilateral side and inhibitory input from the contralateral
side= LSO cells will respond effectively between the level differences in ears
-ITD cues are processed by the medial superior olive (MSO) in which the bipolar cells
respond best when the neural input from both ears arrive at the cell at the same time
(coincidence detection)
-tuned to low frequencies
, Half-wave rectification - Answer- auditory nerve spikes only occur for one direction of
the BM vibration
synchronization coefficient - Answer- is a number between 0 (poor match) and 1 (good
match) that reflects how well the temporal pattern of neural spikes matches the stimulus
waveform
-increases w/stimulation level, but decreases w/stimulation frequency
auditory periphery - Answer- time-frequency representation where neural pattern
indicates the vibration of the vocal folds during the vowel production. Vocal folds seem
to open about every 10 msec, the pitch of the voice is thus 1000 Hz
cerebral cortex - Answer- most superior region of the central nervous system (CNS)
-controls sensation, perception, and motor activities
what is lateral inhibitory network useful for? - Answer- -lateral inhibition is the ability of
an excited neuron to inhibit the activity of its neighbors
-enhances the intensity contrast between adjacent frequencies and thus facilitates the
perception of spectral peaks and notches
the cochlear microphonic has the same () as the input sound waveform - Answer-
frequency
most afferent auditory nerve fibers innervate the - Answer- inner hair cells
during the depolarization phase of an action potential, which channel opens? - Answer-
NA+ channel
what is spontaneous response - Answer- neural response in the absence of sound
which is not a feature of the neural tuning curve - Answer- compressive nonlinearity
what is an auditory nerve fiber's characteristic frequency? - Answer- the frequency at
the trough of the tuning curve
in the PST histogram, which response rate is the highest? - Answer- onset response
neurons fire/do not fire at a particular phase of stimulus but the may/may not fire in each
stimulus cycle - Answer- fire/may not
if an ISI histogram has peaks at 4, 8, 12, and 16 msec, what is the likely frequency of
the sound? - Answer- 250 Hz
what is the limitation of rate code of intensity? - Answer- limited dynamic range
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