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19 Cards in this Set
- Front
- Back
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what are the names of the vestibular sacs?
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the saccule and the utricle
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what do the vestibular sacs detect?
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tilt and linear acceleration
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how do the saccule and the utricle work?
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tilting or acceleration of the person causes the otoliths to cause the gelatinous mass with embedded hair cells to shift. when the hair cells shift, they fire.
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what is the name of the small "pebbles" in the vestibular sacs?
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the otoliths
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what is the name of the fluid which fills the semi-circular canals?
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the endolymph
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what do the semi-circular canals detect?
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rotational acceleration
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What is the name of the somewhat circular chamber at the base of the semi-circular canals?
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the ampula
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What is the name of the tongue-shaped sensory structure?
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the cupula
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What is the name of fixed base of the cupula?
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the crista
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What does the crista house?
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The hair cells and the vestibular nerve fibers.
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How do the semicircular canals work?
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When the head undergoes rotational acceleration, the fluid in the canals is displaced, bending the cupula (and the hair cells) and making the nerve cells fire.
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what is the take-home message about the vestibular brain pathways?
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the vestibular nerve info is mostly projected into the brain stem and the older brain
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what is vestibular nystagmus?
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The reflexive movement of your eyes in conjunction with bodily rotation and vestibular stimulation.
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what is vestibular habituation?
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vestibular system adapts to constant movement...perception of movement will diminish; no accel=movement not really sensed
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what does the Sensory Conflict Theory say?
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the disparity between visual and vestibular information causes motion sickness
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What was Treisman's explanation of motion sickness?
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A distruption in the close coordination of visual and vestibular systems may signal that you have been poisoned, so nausea is a way to make you through up the poison.
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what's the deal with pilots and simulator sickness?
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Pilots get more simulator sickness because they are more used to flying in a real plane, and you have expectancies for how the senses should go together
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Which ranges of motion particularly induce motion sickness?
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Slow movement, particularly vertical, .15-.25 Hz.
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What are some other orienting senses in the animal kingdom?
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Electric field-eel, lateral line (is their body in a straight line)-eel, magnetic sense (magnetic otoliths)-bees, turtles
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