Eclipse Additional Information Page 208
Q: Why can I not choose rise/fall and plateau for Blackman tone burst?
A: Manual allows you to specify the rise/fall and the plateau yourself. The Blackman envelope (or win-
dow) does exactly this - it specifies at what rate and speed to increase and decrease the stimulus level
to obtain good frequency specificity. That is why it is not possible to ask for both Blackmann and spe-
cific choices of rise/fall and plateau. You can only specify how many sine waves you want for the stim-
ulus. If you want a slight improvement in the frequency specificity, you may choose 6 or more sine
waves for Blackmann - the longer stimulus will though lessen the synchronicity of the neurologic re-
sponse a little. We recommend using 3 sine waves for Blackmann at 500Hz and 5 sine waves for all
other Tone Burst frequencies. 5 sine waves is used in ISO 389-6 standard, that specifies peRETSPL
used in establishing the correct nHL values.
Q: I get a printout from a historical session that looks different from my default Print Wizard.
A: The printout of a historical session depends on Print Wizard when the session was saved. If you want
to change the print in a historic session press Design and preview session from the file menu. This
will allow you to make temporary changes in the print out prior to printing.
Q: I get an artifact in the first few milliseconds how do I avoid it?
A: The very large spikes at time 0-1ms especially on curves using high intensities (red circles). Note
also the trigger is interfering at 1.9ms (1ms triggerpulse + 0.9ms delay from insert earphones). The
trigger interferences are in this case market with Jewett I). This is not a correct ABR recording, but
an electrical artifact caused by electrical coupling from the headphones to the input circuit when
high sound stimuli intensities are used.
To solve it use insert earphones instead, use a lower sound intensity, and use shielded headphones. A
shielded headset will still produce a small artifact using intensities above 90dB SPL.
Move the recording window to after the artifact.
10.2.4 ABR Latency data
Q: When entering latency template data, there is a choice for male or female. Why?
A: Most experts report a systematic gender effect. If the clinic does not want to differentiate between
male and female, then they can enter the same values in both files. It is a once in a lifetime job, so the
extra small inconvenience should be tolerable.
Q: Automated “Suggest Waveform Markers” is not working even though it is not dimmed.
A: No latency template data are entered for this type of patient gender, age and/or/ stimulus intensity.
Q: Can I make the Waveform Markers jump from peak to peak during the Marker placement proce-
dure?
A: Yes and it is very convenient. Select the marker you want to place or move. Next select Crtl+left or
right arrow key on the keyboard, and the Waveform Marker will jump.
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