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2 PATHWAYS FOR SOUND IN COCHLEA |
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1. Air Conduction 2. Bone Conduction |
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Where is begining of Transduction? |
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headphones, inserts tests the entire auditory systems |
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What can Disrupt Conduction? |
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SNHL: problem cochlea Conductive Mixed |
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How Test Bone Conduction? |
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Bone Fibrator or oscillator does NOT test outer/middle ear |
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What can disrupt Bone Conduction? |
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problems with outer/middle ear will not show up on test |
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Single Frequency/Pure Tone |
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dB SPL physical presense of sound |
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Intensity Dimension of Sound |
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Hearing Level Scale converts _____ |
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converts Audibility Curve into Straight Flat Line |
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flat line conversion of curve someone CAN hear 0 dB HL someone CANNOT hear 0 dB SPL |
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Minimal Audibility Curve sound is presnt is ___ dBHL |
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Graphic Representation of Hearing test results based on dBHL |
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dots represent speech sounds HL wl have less dots AI shows how HL will affect day-to-day |
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shows which frequency and intensity levels different speech sounds come in |
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loss by air conduction testing, normal bone conduction becuase cochlea normal |
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equal loss by air & bone conduction (problem with cochlea and beyond) |
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loss by bone, with greater loss by air typically |
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1. Degree 2. Configuration 3. Type 4. Symmetry |
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Accurate Diagnosis of HL requires |
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Slight/Minimal Degree
used with children NOT adults |
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is 20 dB normal for adult? |
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HL affects all frequencies same |
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Precipitous Configuration |
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extrememly steep slope severe drop |
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fluid or obstruction in outer/middle nerve NOT damages if get sound louder can understand |
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more dx to nerve hair cells connect cochlea to nerve making sound louder DO NOT help |
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___ million Americans 18+ have HL |
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~32 million Americans 18+ have HL |
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Significant Reduction in ___ life |
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interpersonal relationships |
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Increased Functionality in adult wwith Alzheimer's if __ |
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___ children with unilateral HL have repeated a grade in school |
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about ___% school aged children have some kind of HL |
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average deaf child with no amplification has ___ words at age 6 |
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