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Psyc 406 Final Exam Devices Questions For Success 2024
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Psyc 406 Final Exam Devices Questions For Success 2024
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Psyc 406 Final Exam Devices Questions ForSuccess 2024
What are the five basic organs in the vestibular system?
3 semicircular canals (anterior, posterior, and horizontal)
2 otolith organs (utricle and saccule)
What three major rotational axes do human's experience?
X- Roll (forward)
Y-Pitch (laterally)
Z- Yaw (vertically)
The vestibular system (3 semicircular canals) helps us perceive what?
Head motion/angular acceleration
perpendicular movement
The otolith organs help us perceive what?
Linear acceleration and gravity
Have stones in them (shearing mechanisms)- move cilia
,counterpull
Utricle
Contains about 30,000 hair cells
Orientate more/less horizontally
detects gravitational pull (gravity)
Saccule
Contains about 16,000 hair cells
Orientate more/less vertically
Moving from 0-60 in a straight line (linear acceleration)
The vestibular system fires at a rather high rate (when we are still), if so, what to
fire even more?
, In the absence of stimulation, hair cells release neurotransmitter at a constant rate
- they are firing even when you are still and not moving
• It's detection of CHANGE that gets them firing.
• When hair cell bundles bend, change in hair cell voltage is proportional to the
amount of deflection
Bending toward tallest (kinocilium) stereocilia:
Depolarization
Bending away from tallest stereocilia Hyperpolarization
Hair cells increase firing to rotation in one direction and decrease firing to rotation
in the opposite direction
what accounts for our sense of spatial orientation?
Seeing linear motion (sensed when accelerating or decelerating in a car – it’s
motion in a specific direction), angular motion (sensed when rotating head side to
side as if saying “no”) and tilt
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