Probe Placement; Stimuli For Real-Ear Measures; Tone Stimuli - Interacoustics Affinity 2.0 Additional Information

2.0
Affinity Additional Information
In this example when going to REIG/REAR the system will show Warble Tone and ISTS in the stimulus
dropdown.
2.6.5

Probe Placement

It is important that the probe is placed correctly in the ear of the client (e.g. within 5 mm of the eardrum).
Approximate insertion depths
Females 27 mm past the inter-tragal notch
Males 30-31 mm past the inter-tragal notch
Children 20-25 mm past the inter-tragal notch
Use the black marking ring on the tube to help place the probe at the right depth in the ear canal.
If uncertain the probe placement tool in the REM440 assist in inserting the probe correctly.
This is accessed under Menu/Mode/Probe Placement.
When the red column appearing on the screen is as low as possible, mark this position on the probe and add
10 mm. Correct probe placement will then be obtained (Sullivan 1988).
Click STOP to exit the probe placement tool.
2.6.6

Stimuli for Real-ear Measures

Choosing the correct stimuli for the purpose is extremely important as it is the basis of a good measurement
with a valid result. Digital hearing aids automatically adjust the amplification depending on the input. This
feature, however, cannot be reflected in a real-ear measurement unless a realistic and dynamic test stimulus
like speech for example is used (Fabry 2004).

2.6.6.1 Tone Stimuli

For many years pure tones (sinusoids)/warble tones were the primary signals used for real-ear as well as
coupler verification. Tone signals are "simple" signals and only one frequency is presented at a time.
Therefore, real-ear measurements performed with tone signals do not reflect advanced signal processing
(Kuk & Ludvigsen 2005).
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