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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Adam,<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:36.0pt'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>It’s been a while since
I last worked with the Tobii, so I might be wrong here, but I think it’s
unlikely it has anything to do with the monitor’s refreshing. First, the
monitor always refreshes in a fixed number of hz, I’ve never heard of
anything you can do to stop this updating entirely, even though you can
typically change the number of refreshes in system>control panel>display
options>hardware (or something like that) – but less than 0.3 Hz
(given your stimuli’s duration): forget it. Obviously, you normally wish to
sync your stimulus presentation with refreshes (that’s the common
problem), which you can set in E-Prime (onset sync, etc). Second, the Tobii
output when it doesn’t know where a subject is looking (either because of
the subject moving a lot, the subject blinking, or hardware problems) is also
-1. Ask your subject not to blink too much might be the best course of action.
You might also want to change the sample-rate of the Tobii – ours could
go to 120 Hz, but its output at higher sample-rates (>80 Hz) wasn’t
too brilliant. <o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:36.0pt'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Anyway, Tobii gives validity
markers for time-points in which the output can or cannot be trusted –
see documentation – I expect your “-1” output is probably
also marked as invalid. Just delete the invalid data.<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:36.0pt'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-indent:36.0pt'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Hope this helps.<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:36.0pt'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Mich<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Michiel Spapé<o:p></o:p></span></i></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Research Fellow<o:p></o:p></span></i></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Perception & Action group<o:p></o:p></span></i></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>University of Nottingham<o:p></o:p></span></i></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>School of Psychology</span></i><i><span style='font-size:10.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></i></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> e-prime@googlegroups.com
[mailto:e-prime@googlegroups.com] <b>On Behalf Of </b>Adam Osth<br>
<b>Sent:</b> 10 November 2009 22:46<br>
<b>To:</b> e-prime@googlegroups.com<br>
<b>Subject:</b> display refreshing in tobii eyetracking extensions for eprime?<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Hello all,<br>
<br>
I'm currently running EPrime 2.0 with extensions for Tobii for eyetracking. I
have this problem where in the data, every trial seems to have a couple of
points in which "-1" is returned for the fixation location. I've
heard that this is caused by the display refreshing after a certain amount of
time. Is there any way to control when the display refreshes so it won't do
that when a stimulus is being presented?<br>
<br>
It should be noted that my stimuli only display for 4500 ms, so it doesn't have
to refresh while the stimulus is up.<br>
<br>
Adam<br>
<br>
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