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8/11/2019 Anatomia y Distintas Pruebas de Evaluacion
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SPHSC 461- Hearing ScienceLab 1 – The Conductive Apparatus
Spring 2011
Bonnie Lau
blau@u.washington.edu
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Introduction
1.The Conductive Apparatus
2.Otoacoustic Emissions3.Masking and the Critical Band
4.Audibility Curve and Loudness Scaling
5.Loudness and Temporal Integration6.Speech Perception
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Introduction
Labs are graded high-pass/pass/fail:
High-pass - Attendance at lab, complete andaccurate lab assignment
Pass - Attendance at lab, complete and
adequate lab assignment (points deducted ifyou do not label graphs properly)
Fail - If not present at lab or if the lab
assignment was poorly done
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Introduction
Labs can be handed in:
1. Day of lab
2. Beginning of lab the next week3. My mail box in Eagleson
• Labs cannot be made up
• Late labs will not be accepted
• It you are absent from a lab, you will receive a “fail”grade
• You must attend the lab that you are registered for
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Lab 1 – The Conductive Apparatus
Part 1: Outer Ear
Work Station 1: OtoscopesWork Station 2: Transfer Function
Part 2: Middle Ear
Work Station 3: Tympanometry
Part 3: Inner Ear
Textbook
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Outer and Middle Ear
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External Ear
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Pinna
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Otoscopy
http://www.whnt.nhs.uk/UserFiles/Image/WUTH%20Website/Audiology/otoscopyweb2.jpg
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How does it work?
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Transfer Function
Frequency
A m p l i t u d e
Frequency
A m p l i t u d e
This goes in This comes out
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Transfer Function
The transfer functionof the external ear
shows a boost in thefrequencies between2 and 5 KHz
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Real Ear Measure
http://www.hearinglossweb.com/Medical/aud/img/real1.JPG
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Transfer Function Information
Hz dB
Inside
dB
Outside
dB
Diff
250 6.0 5.5500 9.0 7.0
1000 5.0 4.4
2000 4.0 1.3
4000 5.5 2.5
6000 8.9 1.3
8000 5.5 1.9
Group Person Example
Hz dB
Inside
dB
Outside
dB
Diff
250 3.9 3.0500 8.0 8.0
1000 6.1 3.5
2000 5.0 1.9
4000 7.5 2.2
6000 2.5 1.9
8000 5.5 1.5
Graph the dB Difference (LABEL AXES)
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How to Get the Gain in dB Data
Gain at 250 Hz is 0 dB
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Middle Ear Function – Impedance
Mismatch
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Tympanometry
SoundSource
Pressure
Microphone
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Tympanometry – Basic Concepts
• The TM vibrates most efficiently when the pressure onboth sides is equal
• As the TM is displaced from its resting position by positiveor negative pressure in the external ear canal, thevibratory efficiency of the membrane is decreased
1. Load TM with air pressure equal to +200 daPa, measure
compliance
2. Measure compliance as pressure in the canal is decreased to 0
daPa (atmospheric pressure)
3. Negative pressure is created by the pump and compliance
measurements are made
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Tympanometry
Purpose: determine the point and
magnitude of greatest compliance
Generally conducted with a lowfrequency probe tone (e.g. 226Hz)
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Tympanometry
Middle-Ear Pressure-thepoint when pressureon both sides is equal
External-Ear CanalVolume - volume fromthe end of the probetip to the tympanicmembrane
Acoustic
Compliance/Mobilityof the TM-variouspoints at which thetympanic membranepasses or reflectssound
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Tympanometer Output
1)Volume (ml)
2)Peak Pressure (daPa)
3)Compliance mmho (ml)
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Acoustic Compliance
Reflects more sound Reflects more soundPasses more sound
Impedance Impedance
Admittance or compliance
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Normative Values
A – normal ME function, greatest
compliance at 0 daPa
As – “stiffness/shallow”, peak at
0 daPa, but shallower – partiallyimmobilized stapes
Ad – “discontinuous/deep”,
abnormally high amplitude,
flaccidity of the TM or separation
of ME bones
B – flat, point of greatest
compliance cannot be found
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Normative Values
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Inner Ear
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Inner Ear
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Cochlea Stretched Out
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Organ of Corti