audiology week 3
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This 3 page Class Notes was uploaded by Alicia Notetaker on Sunday February 14, 2016. The Class Notes belongs to CDS 290LEC at University at Buffalo taught by Wei Sun in Spring 2016. Since its upload, it has received 17 views.
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Date Created: 02/14/16
Lecture 4 Sound Intensity and Psychoacoustics (SLIDE 1) ( Sound localization—at end of lecture) – (SLIDE 2) (SLIDE 3) (SLIDE 4) (SLIDE 5) Lecture 5 Anatomy and Physiology Outer and Middle Ear (SLIDE 1) (SLIDE 2) tube(external auditory canal) connected to pinna -at end of tube is ear drum (SLIDE 3) pinna is collecting sound -you can always see the helix (SLIDE 4) can only see a small portion of this -canal is not straight -outer portion is very soft (SLIDE 5) should use water to get wax out of ears -not recommended to do this by yourself (need to use a certain temperature water) -you don’t have to clear out ear canal every day (SLIDE 6) end of ear canal is ear drum (tympanic membrane) (SLIDE 7) (SLIDE 8) several small bones called ossicles: look connected but there is cartilage separating them (SLIDE 9) (SLIDE 10) (SLIDE 11) movement is very flexible (SLIDE12) (SLIDE 13) (SLIDE 14) (SLIDE 15) (SLIDE 16) (SLIDE 17) (SLIDE 18) (middle ear function: impedance matching) -transfer vibration from one medium to another (SLIDE 19) (SLIDE 20) apply force on eardrum -bride between eardrum and inner ear (SLIDE 21) TM: tympanic membrane -impedance matching: increase intensity (SLIDE 22) Lecture 6 Anatomy and physiology inner ear (SLIDE 1) inner ear is not flat -inside middle ear is inner ear -vestibular and cochlear are connected -vestibular: movement -vestibular: 3 circuit canal -cochlear: tube (snail shape) -inside coil is 2 membranes (SLIDE 2) (SLIDE 3) fluid outside of cell (SLIDE 4) (SLIDE 5) size of fluid is not compressible: cannot be changed (SLIDE 6) (SLIDE 7) cochlear can vibrate based on diff frequencies (SLIDE 8) (SLIDE 9) hair cells were there when born and cannot be regenerated (SLIDE 10) (SLIDE 11) ions flow from positive end to negative end -inner hair cells send most information to brain (SLIDE 12) (SLIDE 13) when hair cells depolarize-release transmitors (SLIDE 14) (SLIDE 15) when you produce a sound, a lot of activity in cochlea (SLIDE 16) aging: first target outer hair cells (SLIDE 17) (SLIDE 18)
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