Hi Marianne,<br><br><a href="ftp://sccn.ucsd.edu/pub/locfiles/neuroscan/">ftp://sccn.ucsd.edu/pub/locfiles/neuroscan/</a> has a location file for a 64-channel cap. If the locations of the 32 channels in your cap are the same as those (just with 32 channels missing), then you could edit that file by removing the channels you don't have. I'm not sure if the locations are the same, though, since I haven't used Quik-cap; if you do this, you should try plotting the channel locations afterwards to make sure they're correct.<br>
<br>You also might find some helpful information in a previous discussion on this issue: <a href="http://sccn.ucsd.edu/pipermail/eeglablist/2011/004243.html">http://sccn.ucsd.edu/pipermail/eeglablist/2011/004243.html</a><br>
<br>Best,<br>Steve<br><br><div class="gmail_quote">On Fri, Sep 28, 2012 at 3:05 AM, Marianne Løvstad <span dir="ltr"><<a href="mailto:mar.lovstad@gmail.com" target="_blank">mar.lovstad@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello<div><br></div><div>We are currently using Quik-cap 32 channels to record eeg data on a Neuroscan system. Do anyomne know of a channel location file we can use in eeglab?</div>
<div><br></div><div>Marianne Løvstad<div><div class="h5"><br><br>
<div class="gmail_quote">2012/9/26 Andreas Widmann <span dir="ltr"><<a href="mailto:widmann@uni-leipzig.de" target="_blank">widmann@uni-leipzig.de</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br>
<br>
googling the list archives (<a href="http://www.google.com/search?q=highpass+site:sccn.ucsd.edu/pipermail/eeglablist/" target="_blank">http://www.google.com/search?q=highpass+site:sccn.ucsd.edu/pipermail/eeglablist/</a>) gives you several threads discussing this problem, e.g.<br>
<a href="http://sccn.ucsd.edu/pipermail/eeglablist/2008/002210.html" target="_blank">http://sccn.ucsd.edu/pipermail/eeglablist/2008/002210.html</a><br>
<br>
In a nutshell: The filter order as suggested by EEGLAB is too high for this extreme cutoff-frequency. Use higher cutoff or different filter type. Transition band width is defined as cutoff * 0.15 for firls-based filters in EEGLAB IIRC.<br>
<br>
Note:<br>
I recommend upgrading to a more recent version of EEGLAB where fir1 is used as default filter function (in case you did not select firls explicitly). firls-based filtering does not give optimal results (<a href="http://www.frontiersin.org/Perception_Science/10.3389/fpsyg.2012.00233/full" target="_blank">http://www.frontiersin.org/Perception_Science/10.3389/fpsyg.2012.00233/full</a>).<br>
<br>
Best,<br>
Andreas<br>
<br>
Am 21.09.2012 um 17:03 schrieb <a href="mailto:tmle@notes.cc.sunysb.edu" target="_blank">tmle@notes.cc.sunysb.edu</a>:<br>
<br>
> Hi eeglablist,<br>
><br>
> I have been attempting to apply a highpass filter to our 64-channel data set. So far I have only resampled (to 256) and rereferenced (to average reference) prior to this step. However, when I enter .01 for the lower edge in the basic filter option, eeglab will run for about 20 minutes then give me an out of memory error (eeglab error in function firls() at line 150). Could you please let me know why this might be the case? I'm not sure whether my laptop memory is a problem as it has 8G of RAM. Also, eeglab says the eegfilt () - highpass transition band width is 0.001Hz. Shouldn't this be .01 like I have entered for the lower edge?<br>
><br>
> Thanks,<br>
><br>
> Le<br>
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</blockquote></div><br><br clear="all"><div><br></div></div></div><span class="HOEnZb"><font color="#888888">-- <br><div><br></div><div><br></div><div></div><div></div>Marianne Løvstad<br>Psykologspesialist/Ph.d. student <br>
Sunnaas sykehus<br>tlf: <a href="tel:%2B%2047%2093%2045%2020%2003" value="+4793452003" target="_blank">+ 47 93 45 20 03</a><br>
</font></span></div>
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