<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">By all means!<div><br></div><div>Joe</div><div><br><div><div>On Sep 6, 2012, at 12:52 PM, Daria Laptinskaya <<a href="mailto:daria.laptinskaya@googlemail.com">daria.laptinskaya@googlemail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Thanks you all for the answers!<br>It seems to be a problem with reading the raw.-files.<br>My collegue found a formula, maybe we can use it for microvolt-scaling.<br><br>@Joe: It would be a great helf, if you could have a look at one of the files.<br>
Can I send you a dropbox-link?<br><br>Best,<br>Daria<br><br><br><div class="gmail_quote">2012/9/6 Joseph Dien <span dir="ltr"><<a href="mailto:jdien07@mac.com" target="_blank">jdien07@mac.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word"><div>The Simple Binary (.raw) files don't get corrected for gain when imported (I helped write them). I've experienced occasional unpredictable bugs with NetStation export routines where the files are generated with amplitudes many times too large, even with text format files. It's a bit disconcerting to say the least. I could take a look at your files if you'd like confirmation.</div>
<div><br></div><div>Joe</div><div><div class="h5"><br><div><div>On Sep 4, 2012, at 4:00 PM, Ingrid Nieuwenhuis <<a href="mailto:inieuwenhuis@BERKELEY.EDU" target="_blank">inieuwenhuis@BERKELEY.EDU</a>> wrote:</div><br>
<blockquote type="cite">
<div bgcolor="#FFFFFF" text="#000000">
Hi Daria,<br>
<br>
Also, did you try looking at your raw data (so before the ERPs are
made) in FieldTrip and in Net Station? So open your .raw data in
NetStation. You can just look at a random participant's data, and
check if the scale is the same. I'm pretty sure no amplification
takes place when reading in the data into FieldTrip, this check can
confirm that. Hope this helps, and let us know what you find.<br>
<br>
Cheers,<br>
Ingrid<br>
<br>
<br>
<div>On 9/3/2012 1:35 PM, Robert Oostenveld
wrote:<br>
</div>
<blockquote type="cite">Hi Daria,
<div><br>
</div>
<div>There might indeed be an incompatibility in the gain value
applied to the data.</div>
<div><br>
</div>
<div>If you are able to export the data using the EGI software in
another format (e.g. EDF), you could read them both into
FieldTrip and compare the timecourse aplitudes to check whether
they are different. In case they are, I suggest to involve EGI
support. They are aware of the FieldTrip reading functions and
will know much more about the internals of their various file
formats.</div>
<div><br>
</div>
<div>best regards</div>
<div>Robert</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
<div>
<div>On 3 Sep 2012, at 17:22, Daria Laptinskaya wrote:</div>
<br>
<blockquote type="cite">Dear Fieldtrippers,<br>
<br>
I analysed EGI-data (.raw-files, NetStation 4.3.) with the
fieldtrip toolbox. <br>
The ERPs look perfect. <br>
The 'only' problem is, that my signals look to strong.<br>
It looks like if I get amplitutes (average) until 70 <span>µ</span>V.
<br>
I think it must be an intern amplifier for the signals.<br><p class="MsoNormal"><span>Does anyone know this problem
with EGI-data?</span></p><p class="MsoNormal">Or does anyone know, where I can see
the amplifier?<br>
</p><p class="MsoNormal"><br>
<span></span></p><p class="MsoNormal"><span><br>
</span></p><p class="MsoNormal"><span>Greetings,</span></p>
<span>Daria</span>
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<br>
<pre cols="72">--
Ingrid Nieuwenhuis PhD
Postdoctoral Fellow
Sleep and Neuroimaging Laboratory
Department of Psychology
University of California, Berkeley
California 94720-1650
Tolman Hall, room 5305</pre>
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