otometrics AURICAL Aud, Reference Manual

Page: 60 / 136

2.14.1.2 The test process - SISI
The audiometer produces an intensity increment every 5 seconds. Each increment has a rise time of 50 msec, a duration
at full strength of 200 msec, and a decay time of 50 msec. The size of the increment can be varied from 0 to 5 dB in 1 dB
steps (selected on-screen from the Increment box), although the test is scored only on the percentage of 1 dB increments
correctly identified by the patient. Twenty 1 dB increments are presented during the test. If the subject responds 10
times out of the 20 1 dB increments, the sensitivity index is 50%.
Before starting the test
Before starting the test, present five 5 dB increments to give the patient a noticeably intense increment to respond to.
2.14.2 ABLB (Alternate Binaural Loudness Balance)
This test was first described by Fowler (1928).
Hearing levels at which a pure tone sounds equally loud to both ears of a subject are compared.
The test is applicable when there is a difference in hearing loss of at least 20 dB between the two ears at the pure-tone
test frequency.
2.14.2.1 Navigating in ABLB
The Control Panel
Channel
Continuous On When checked, the stimulus will be continuously on and will turn off when you press the stimulus
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 Left transducer is considered the ABLB test ear.
Right Right transducer is considered the ABLB test ear.
Test Options - ABLB
Transducer
dB Step
This determines the dB step size for the intensity of the reference stimulus tone. Options are 1, 2,
and 5.
ABLB dB Step
This determines the dB step size for the intensity of the ABLB test stimulus. Options are 1 (should be
used for testing), 2, and 5.
60 Otometrics - AURICAL Aud
2 Navigating in the OTOsuite Audiometry Module