Chapter 10 Flashcards
The half gain rule
Gain chosen which is approximately half the amount of threshold loss
REAR
Real Ear Aided Response - Specifies how much the SPL at the eardrum should exceed the SPL in the incoming field - how much benefit you are getting form both the aid and ear acoustics when the aid (ear mold) is in the ear and on.
REIR
Real Ear Insertion Response - How much more signal should be at the ear drum when the person is aided than when the person is not aided - the benefit form the aid without the ear acoustics (REUR)
REUG
Real Ear Unaided Gain - this is the response of the ears natural acoustics
REOR
Real Ear Occluded Response - hearing aid is in the ear but turned off - used for troubleshooting
SII
Speech intelligibility index. Tells you how audible the speech is and adjust gain based on which frequencies are useful for speech. (0- in audible 1-audible)
Acclamatiztion
Long term changes in the hearing abilities of patients - the amount of gain preferred by the patient may gradually increase over time because the auditory system readjusts to the increased cochlear output - adaptation to gain
Dead regions
A particular region of the cochlea where there are no functioning IHCs and/or no auditory nerves to which they connect
Issues in high frequency amplification
At high frequencies,
1) The intensity of speech weakens
2) Hearing loss increases
3) The ability to extract information decreases as hearing loss increases
Compression threshold (in multi channel aids)
The level of the signal within any channel at which that channel enters compression
How do you prescribe for a conductive hearing loss
1) Prescribe gain for the sensorineural part of the loss
2) Prescribe additional gain at each frequency equal to 75% of the conductive loss at each frequency
RESR
Real Ear Saturation Response - an estimate of the maximum SPL that a hearing aid can put out when measured in the real ear
