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is higher only manual mode will be available for patient training purpose. A percentage of the correct given
answers will be available at the end of the sequence (SISI Score). To vary the increment size press F1; to vary
the frequency rate press F2.
Tone Decay test
This test evaluates the ability of the subject to perceive a stimuls for a determined length of time. The
subject receives an acoustic stimulus at a certain intensity and frequency for 60 sec. The subject must give
a response until he/she can hear the signal. It is possible to increase the intensity of the signal, with 5 dB
steps, from the moment the subject cannot hear it anymore. To increase the intensity of the stimulus during
the test use the channel 1 knob (4).
Stenger
With this test it is possible to send the same type of stimulus to both ears simultaneously. This test is used
to evaluate the masking eect of a signal sent to an ear when the opposite ear receives the same signal
but at a dierent intensity. In addition to the Pure Tones, it is possible to use the same input signals present
in speech audiometry (speech material from external players, from the operator’s microphone, from the
SD card present in the device). For this test it is not possible to visualize audiograms that were previously
stored.
Bekesy Automatic Audiometry Test
Test used to diagnose problems relative to the acoustic nerve. The test is conducted in automatic mode with
the subject’s collaboration. The subject has to give a response only when he/she hears the output stimulus.
As a stimulus, pure tones at dierent frequencies sent in continuous, pulsed (presentation frequency 2
Hz), lot (presentation frequency 1 sec mode, ON=200 msec, OFF=800 sec) are used. The increment of the
output stimulus will be continuous and with variable speed (1 dB/sec, 2.5 dB/sec, 5 dB/sec). The frequency
variation can be xed (frequency steps in octaves), or continuous (frequency sweep). It will also be possible
to select the presentation sense of the stimulus: from high to low frequency or vice versa. The overall exam
time can be between 30 to 60 sec. for the xed presentation mode and 60 sec. for the sweep mode.
Once inside the test page, use the following commands for the dierent settings:
For stimulus presentation mode (continuous, pulsed, lot) use F1.
To increment speed of the stimulus press F4>F5 then F5 for variations.
For the frequency variation (xed or sweep) press F4>F5 then F4 to choose.
For the presentation sense (low>high or high>low) press F4 then F3 to choose.
For test duration (30sec or 60 sec) press F4>F5 then F6 to choose.
Test GAP (Gap Detection Threshold)
Gap detection testing can be done several ways, but the premise is to introduce two stimuli (tones,
clicks, broad band noise) of some duration with a variable gap between them. The subject is to identify
when the temporal gap when the two stimuli are heard as one sound or two. The threshold at which
the gap is suciently wide to be heard as two sounds is the ‘’gap detection threshold.’’ Research on
speech perception indicates that persons should be able to hear transitions of formant frequencies
of speech in the 0 to 20 millisecond range, so that the assumption is that gap detection thresholds
greater than 20 milliseconds are abnormal and a temporal processing disorder may be present. The
greater the gap detection threshold, e.g. up to 300 msec, the greater the probability that a person will
have diculty with speech discrimination.
To change the GAP use F1 softkey or
left
and
right
(10) arrow keys.
To change the Rate use F2 softkey.
To perform the test set CH1 stimulus (WN or SN) at a comfortable level and press START/STOP (19).
Patient should press the patient push button if he can recognize the GAP. At the end of the test a
score will be automatically calculated based on heard stimuli percentage; the value can be stored by
pressing STORE (20) key.
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