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SHS 311 test 2b
Terms in this set (26)
All auditory nerve fibers have the same firing rate
isointensity curve gets wider with increasing level
Phase locking works best at very high frequencies
Auditory nerve tuning curves are steepest on the high-frequency side.
Which type of afferent auditory nerve fibers are myelinated?
What are the steps of the action potential in order?
1. The release of glutamate makes the neuron slightly more positive from the original resting potential of -70 mV.
2. A criterion threshold of -55 mV is reached, and an action potential is triggered.
3. The change in neuron voltage triggers the opening of Na+ ion channels, and Na+ enters the neuron through a concentration gradient.
4. The neuron depolarizers.
5. Equal concentrations of Na+ are reached inside and outside the neuron so Na+ channels close. Voltage-gated K+ channels open, and K+ leaves, drawn out by the concentration gradient.
6. The neuron re-polarizes, and actually hyper polarized into a refractory period.
7. The neuron returns to its resting state.
Which efferent pathway would we consider the strongest?
There are three auditory fiber types, what is the relationship between the spontaneous rate of fire and the threshold of the fiber?
High spontaneous rate fibers have lower thresholds
We have a phase-locked auditory nerve response to a 200 Hz tone. Which of the following integer multiples could we expect a spike at?
1/200= 5 ms
isointensity curves demonstrate that when considering the response characteristics of auditory nerve fibers, as levels increase, the range will of frequency responses will
What brain lobe is the auditory system in?
Tonotopic organization is present in the central auditory nervous system.
In central auditory processing disorder (CAPD), listeners will have difficulty with understanding speech in noise.
In the central auditory nervous system, fibers do not crossover and decussate from one side of the brain to the other.
nystagmus is an indicator that something is wrong in the peripheral or central nervous system.
What structures detect angular acceleration?
What structures detect linear acceleration?
What are the two major components of the balance system?
The motor component and the sensory component
In the utricle and saccule, the hair cells are contained between 2 different structures. The base structure is called the _________ and the upper structure is called the _________.
1. Base- macula
2. Upper layer- otolithic membrane
Match the semicircular canals that serve excitatory/inhibitory partner canals to one another.
Right anterior- left posterior
Left anterior - right posterior
Right horizontal - left horizontal
In the semicircular canals, the hair cells are contained between 2 different structures within the ampulla. The base structure is called the _________ and the upper structure is called the ___________.
1. Base- Crista ampullaris
2. Upper layer- Cupula
Which of the following best describes the connection between the vestibular system and the eyes.
Afferent fibers from the semicircular canals connect to the motor neurons of the extraocular eye muscles via the vestibular nuclei in the brainstem.
What word best describes repetitive, rapid, uncontrolled eye movements?
What is the difference between linear and angular acceleration?
Linear acceleration does not involve a change in acceleration, and angular acceleration does involve a change in direction.
The auditory cortex is located in the _____ lobe of the brain.
Label which portion of the ascending auditory pathway each structure is contained within:
1. Cochlear nucleus
2. Superior olivary complex
3. Inferior colliculus
4. Medial geniculate
1. Cochlear nucleus- auditory brainstem
2. Superior olivary complex- auditory brainstem
3. Inferior colliculus- auditory midbrain
4. Medial geniculate body- thalamus
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