Pure Tone Testing Flashcards
What is the aim of pure tone testing?
To determine hearing sensitivity across a number of different frequencies. Compare the individual person’s responses to the norms for typically hearing people.
T or F: Pure tone testing is a direct measure of hearing
false - we are measuring the persons response to acoustic signals and assuming this is a measure of hearing
What is hearing threshold
When the person responds 50% of the time
Air conduction testing is done at ______Hz. It measures the response of the whole system.
250 to 8000Hz
Bone conduction testing is done at ________Hz.
500 to 6000Hz
Bone conduction testing bypasses the ___________ ear and determines _________ sensitivity
outer and middle
sensorineural
Why don’t we test bone conduction below 500 Hz?
Too easy to feel
Bone conduction is tested at 500 to 6000 Hz due to ________
equipment limitations
For pure tone hearing testing the equipment is calibrated so that 0dB HL AC = __________
0 dB HL BC
T or F: We need more pressure in the skull to hear bone conduction as loud as air conduction.
True
How was audiometric zero for air conduction found?
testing healthy university students
How was audiometric zero for bone conduction determined?
An artificial mastoid was used and vibrator output was related to normal threshold of hearing at each freq.
Describe the test environment:
Control for external noise
Sound treated or sound isolation booth
One or two rooms
single or double doors
What can affect the reliability of a hearing test?
- calibration of equipment
- test environment
- Patient performance/ mood
- instructions
- patients cognitive level
- examiners skill and mood
- client examiner interaction
An audiogram is a measure of sound or hearing. _______ is the x-axis and ________ is the y axis
frequency (pple can have deficits at diff freq)
dB HL
On an audiogram what symbol and colour represents an :
Air Conduction unmasked Right ear
Red circle
On an audiogram what symbol and colour represents an:
Air Conduction unmasked Left ear
Blue X
On an audiogram what symbol and colour represents an:
Bone Conduction Unmasked Right ear
On an audiogram what symbol and colour represents an:
Bone Conduction Unmasked Left ear
>
T or F: It is okay to write both the left and right ear on an audiogram in blue
True
T or F: It is okay to write both the left and right ear on an audiogram in red
False
On an audiogram for someone with normal hearing both the left and right ear will be equal or better (above) _________ or ________ for children
25dB HL
15 dB HL
When preparing to test clients hearing it is important to think about instructions, patient response, headphone placement, bone oscillator placement and your own skill with the equipment.
Yes it is :)
List the order for an air conduction hearing test:
Begin with 1000Hz
Test each octave in ascending order (up to 8000Hz)
Retest 1000Hz
Test each octave in descending order (down to 250Hz)
When do you need to test interoctave frequencies?
If there is an equal or greater than 20 dB difference between to octaves.
How long do you present the tones? Why?
1-2 sec
- 2 seconds is likely too long
- if they don’t hear it they won’t - But not less than 500 ms
- might be too fast to process
