otometrics AURICAL Aud, Reference Manual

Page: 57 / 136

2.14 Special tests
2.14.1 SISI (Short Increment Sensitivity Index)
The SISI Test was developed by Jerger and co-workers (Jerger, Shedd, and Harford, 1959) and was introduced as a pro-
cedure that was reliable and reasonably objective.
The test consists of superimposing brief bursts of 1 dB intensity increments on a sustained tone presented monaurally
through earphones at a sensation level of 20 dB at each tested frequency.
The patient is instructed to report any jumps in loudness detected while listening to the sustained tone for a period of
about two minutes.
2.14.1.1 Navigating in SISI
The Control Panel
Channel
Continuous On When checked, the stimulus will be continuously on and will turn off when you press the stim-
ulus button.
Transducer
Insert Presents the stimulus through the insert earphones.
Phone Presents the stimulus through the headphones.
High Frequency Presents the stimulus through the high frequency headphones.
Routing
Left
Stimulus is routed to the left transducer.
Right
Stimulus is routed to the right transducer.
Test Options - SISI
Transducer
dB Step This determines the dB step size for the intensity of the stimulus when presenting the tone
manually. Options are 1, 2, and 5.
SISI dB Step This determines the dB step size for the intensity of the stimulus when presenting the tone
automatically using the play button. Options are 1 (should be used for testing), 2, and 5.
Otometrics - AURICAL Aud 57