Pure Tone Audiometry Flashcards
Measurement of the range and sensitivity of a person’s sense of hearing
Audiometry
Two distinct transmission pathways to measure hearing thresholds
Air conduction
Bone conduction
Tones are transmitted through the bones of the skull to the cochlea
Bone conduction
Tones are transmitted through the air from a transducer into the ear canal
Air conduction
Transmission pathway that bypasses the middle and outer ear and directly stimulates the cochlea
Bone conduction
Transmission pathway that passes through the middle and outer ear and ends up at the cochlea
Air conduction
Objectives of Pure tone audiometry
- Quantify the listener’s hearing level
2. Determine his/her ability to perceive sound and understand speech
Results of Pure tone audiometry is used to:
- Identify a disorder/disease
- Aid in habilitation/rehabilitation (amplification with a hearing aid, educational and counseling programs, speech and language services)
Procedure where hearing sensitivity is measured for tones over the frequency range of speech
Pure Tone Audiometry
What is the frequency range of speech?
250-8000 Hz
What frequencies do we test for air conduction?
250, 500, 1000, 2000, 3000, 4000, 8000 Hz
The index of hearing sensitivity is the _______ of hearing
threshold
PTA requires a _____ response only
Detection
What do thresholds not tell us about?
Doesn’t tell us much about the quality of the signal that the listener heard
Doesn’t tell us about the listener’s ability to understand speech at higher suprathreshold levels
The level at which a stimulus is barely perceptible (the subject is aware of the sound at least 50% of the times it is presented)
Threshold
Equipment for Air-Conduction (3)
Sound Isolated Room
Audiometer
Transducer
What are the types of audiometers: (3)
Screening vs. Diagnostic
Pure tone vs. Speech
Manual vs. Automatic
What does an audiometer control for?
the level of the stimulus duration of the stimulus frequency of the stimulus type of stimulus (noise, speech, pure tones) ear under test masking noise
an electronic device used for presenting controlled acoustic signals to a listener to test some aspect of auditory function
Audiometer
Supra-aural earphones and insert earphones are __________.
transducers
Advantages of insert earphones
comfortable
prevents ear canal from collapsing under the weight of the TDH earphones
better attenuation of ambient noise
increased interaural attenuation
Disadvantages of insert earphones
can’t be reused, which increases the cost of testing
What is the purpose of pure-tone screening audiometry?
Used to evaluate a large number of people in a short period of time
To separate people into two groups: those at risk and those not at risk
ASHA Hearing Screening Guidelines
Developed for screening children approximately three years of age to third grade and for high-risk children in other grades
The same guidelines can be used in adults through 40 years old
T/F Pure tones at 500, 1000, 2000, and 4000 Hz are presented at a single level of 20 dB HL
True
A ________ screening outcome is failure to respond to one or more test signals at any frequency in either ear
Positive
A ________ screening outcome signifies no hearing loss
Negative
Specifies hearing sensitivity across the range of frequencies important for everyday communication
Pure-tone Threshold Audiometry
Components of Pure-tone Threshold Audiometry (2)
- Familiarization with the test signal/tone
2. Threshold measurement
Response types in Pure-tone threshold audiometry (3)
Raise hand
Raise finger
Push a button
(can be creative if needed)
A tone should be presented between __ to __ seconds in duration
1 to 2
The tone can be _____ or _____ tones
continuous or pulsed
T/F the time intervals between stimuli should be equal in duration
False! They should vary in duration and not be shorter than the test tone
What is the most common level of the first tone?
40 dB
The procedure of Down 10, Up 5 is called what?
The Modified Method of Limits
T/F If the patient responds to a tone, decrease the intensity by 5 dB until the patient stops responding.
FALSE. Decrease the intensity by ten dB
T/F If the patient fails to respond to a signal, increase the level of intensity 5 dB until a response occurs.
True. Down 10, Up 5 (The Modified Method of Limits)
This occurs when the client responds when a signal was not presented.
False Positive (this can make it difficult to determine threshold)
What is the order in which the frequencies are tested for a client?
1000 Hz –> 2000 –> 3000 –> 4000 –> 8000 –> 1000 –> 500 –> 250 Hz
The procedure of Down 10, Up 5 is called what?
The Modified Method of Limits
