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Pure Tone Audiometry
Exam 2
36
Audiology
Undergraduate 3
10/30/2013

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Term
Threshold
Definition
The level at which a stimulus is barely perceptible. High enough for the subject to be aware of that sound at least 50% of the times it is presented
Term
Hearing Level
Definition
The number of decibels above an average normal threshold for a given signal. The hearing level dial of an audiometer is calibrated in dBHL
Term
Normal Range of Hearing (dBHL)
Definition
-10 to 10 dBSL
Term
False Positive
Definition
Response when no tone is presented often because instructions were unclear or denial of hearing loss
Term
Threshold Test Procedure
Definition
1. Familiarization
2. Threshold search
- start at 1000hz, 2000, 4000, 8000
- repeat 1000, 500, 250
- 10 down, 5 up
Term
Pure Tone Average (PTA)
Definition
The average of the hearing levels at 500, 1000, 2000Hz for each ear
Term
Bone Conduction Frequencies Tested
Definition
250, 500, 1000, 2000, 4000
Term
Conduction Hearing Loss Audiogram
Definition
Air conduction loss, bone conduction within normal range, air bone gap is 10dB or greater
Term
Sensorineural Hearing Loss Audiogram
Definition
Loss in both air conduction and bone conduction, air bone gap within 10dB
Term
Mixed Hearing loss Audiogram
Definition
Loss in both air conduction and bone conduction, air bone gap is 10dB or greater
Term
Conductive Hearing Loss
Definition
Reduced volume of incoming signal, at suprathreshold levels ear acts normally, can usually be treated medically or surgically, configuration is generally flat or low frequency
Term
Sensorineural Hearing Loss
Definition
Reduction in cochlear sensitivity, reduction in frequency resolution, reduction in dynamic range, loss can't be completely over come with amplification, recruitment
Term
Normal Degree of Loss
Definition
10dB or less
Term
Minimal/Slight Degree of Loss
Definition
11-25dB
Term
Mild Degree of Loss
Definition
26-40dB
Term
Moderate Degree of Loss
Definition
41-55dB
Term
Moderately Severe Degree of Loss
Definition
56-70dB
Term
Severe Degree of Loss
Definition
71-90dB
Term
Profound Degree of Loss
Definition
90+dB
Term
Low-Frequency Configuration
Definition
Hearing loss is restricted to the low frequency region of the audiogram
Term
High-Frequency Configuration
Definition
Hearing loss is restricted to the high frequency region of the audiogram
Term
Crossover/Contralateralization
Definition
Results when sound presented to one ear through ear phones crosses the head via bone conduction and is perceived by the opposite ear
Term
Interaural Attenuation
Definition
Reduction in sound energy of a signal as it is transmitted by bone conduction from one side of the head to the opposite ear, occurs at 40dB for supraural headphones and 70dB for insert headphones
Term
Masking
Definition
A procedure where noise is place in one ear to keep it occupied while the other ear is being tested
Term
Benefit of Narrow Band Noise in Masking
Definition
Provides maximum masking with minimum sound pressure
Term
Masking for Supra-aural Headphones
Definition
When the PTT of AC in test ear - PT of BC in the non test ear is greater than 40dB
Term
Masking for Insert Headphones
Definition
When the PTT of AC in test ear - PT of BC in the non test ear is greater than 70dB
Term
Congenital Onset
Definition
Present at birth
Term
Acquired/Adventitious Onset
Definition
Obtained after birth
Term
Sudden
Definition
Rapid onset
Term
Gradual
Definition
Ourring in small degrees
Term
Temporary
Definition
Of limited duration, often conductive
Term
Permanent
Definition
Irreversible, often sensorineural
Term
Progressive
Definition
Advancing in degree
Term
Fluctuation
Definition
Aperiodic changes in degree, often middle ear infections
Term
Better Ear Average
Definition
Average of the best ear frequency at 500, 1000, 2000hz
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