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Lecture 4

NROC64H3 Lecture Notes - Lecture 4: Basilar Membrane, Eardrum, Vestibular Nerve

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Matthias Niemeier

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Lecture 4 auditory and vestibular system
Describe 3 pathways of visual system that are differently specialized for motion, colour,
and shape
Magnocellular, Parvocellular, Conocellular
Hearing and Balance
based evolutionary (still in fish) called lateral lines system
helpful to sense acceleration
response to differentenents
Sound air molecules that bunch together in regions of lower and higher air pressure
Amplitude air pressure
Max - Min = intensity
pitch perception of frequency
amount of physical energy (sound level on graph)
The one ( dot blue) that are at the same horizontal dimension but since the second is
on a higher level, it will be perceived as louder
Outer ear pinna and auditory canal
Tympanic membrane sound pressure waves
three bones smallest bone in body ossicles
oval window cochlea Auditory vestibular nerve
Function of bones
Since the surface area of the needle is smaller than the surface area of the other end
of needle then it goes into the arm of the boy and not into hand of physician even
though the pressure is the same
The attenuation reflex
we listened to louder, higher sound and ignore lower sounds
High potassium in endolymph is important! Usually potassium goes out and not in
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