Speech Audiometry Flashcards
When spondiac words or Spondees can be repeated 50% of the time
SRT- Speech Reception Threshold
The level about 8-10dB below SRT’s where you are aware someone is talking but without enough frequencies represented to understand the words.
SDT Speech Detection Threshold or SAT Speech Awareness Thresholds
At about 130dB SPL for normal ears
UCL- Uncomfortable Loudness Level
The range of usable hearing between SRT and UCL is
Dynamic Range
How to calculate the Dynamic Range
Subtracting SRT from UCL
Ex. 130dB-20dB=110dB Dynamic Range for normal ears
A patient with a conductive loss has a blockage or occlusion that prevents the sound from reaching the inner ear and the threshold of hearing______in the lower frequency
Elevates, greater
Speech Audiometry provides five types of information
- Speech Reception Threshold (SRT)
- Most Comfortable Level (MCL)
- Uncomfortable Loudness Level (UCL)
- Dynamic Range
- Speech Discrimination Score
Normal Range for SRT is
0-20dB HL
How do you find the Sensation Level
SL=MCL-SRT
SL times 2 should estimate Dynamic Range
SL can be a predicting factor in Discrimination Scores
SL verifies the type of Audio (conductive losses have a greater SL than SNL)
SRT, MCL and UCL all convert to SPL by adding ___
20dB
SRT verifies what?
The patient’s PTA give or take 5dB
Results when a louder sound occurs immediately after a softer sound causing the softer sound to be inaudible even though it occurred first
Backward Masking
Occurs when one sound follows another closely in time and the first sound reduces the sensitivity of recently stimulated cells.
Forward Masking
When testing for SRT’s the threshold should start…
First determine the PTA and start thresholds and start SRT testing at 40dB above PTA…if thresholds are unknown start at 50dB
When Testing WR the threshold should begin at___
First determine the PTA and start thresholds and start WR testing at 40dB above PTA…if thresholds are unknown start at 50dB
Although pure tones sound artificial to us, they have the advantage of
Measuring a specific frequency without involvement of other frequencies
Although pure tones sound artificial to us, they have the advantage of
Measuring a specific frequency without involvement of other frequencies
Speech Reception Threshold
Is a level about SDT by about 8-10dB
Dynamic Range is the usable range of hearing between
SRT and UCL
The most comfortable level is
About 65dB SPL for normal ears
About 45dB HL for normal ears
The range between threshold and MCL
Differs at each frequency
When Pt with a conductive loss
The same dynamic range as normal ears
When Pt’s have a sensorineural loss, MCL
Retains a relationship with the lower boundary
Recruitment is
Common in patients with cochlear losses
When a pt has normal pure tone thresholds of 0dB HL across frequencies, it is difficult to accurately measure
SAT
When a pt has a large conductive component, it is difficult to accurately measure:
UCL
Speech discrimination tests
Approximately a sample of speech sounds in an ordinary conversation
The pt has pure tone air conduction thresholds of 40dB HL at each frequency, If the pt has a conductive hearing loss his MCL would be aprox
80dB HL or above
Discriminating complex sounds depend on
Timbre
In a complex sound, the fundamental frequency is the:
Loudest frequency
We recognize the different vowel sounds because of variations in
Timbre
A formant is:
A concentration of energy around certain frequencies
The upward spread of masking occurs when
A Low frequency sound masks out a high frequency sound
Masking is required for discrimination tests when
Masking was used for air conduction tests
Binaural testing
Helps decide which ear to fit
