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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi EEGLAB Users! I am having some problems getting my ERP Triggers show up on my Brainmaster Discovery” 24-Channel EEG System using an EPrime Language experiment.
They have channels 23 and 24 designated for ERP triggers (pulses and fixation) so I am only getting pulses and not the trigger numbers (1s and 2s for my 2 experimental conditions) via the stim cable connected to the printer port. for my 2 experimental
conditions. Does anyone know how to get these triggers on the brainmaster discovery system or how the EEG can use the pulses to create segmentations for these 2 conditions I really appreciate any help or input from you. Cheers!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">M. Mouloua, UCF.<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> eeglablist-bounces@sccn.ucsd.edu [mailto:eeglablist-bounces@sccn.ucsd.edu]
<b>On Behalf Of </b>Makoto Miyakoshi<br>
<b>Sent:</b> Tuesday, July 08, 2014 12:29 PM<br>
<b>To:</b> Germano Gallicchio<br>
<b>Cc:</b> EEGLAB List<br>
<b>Subject:</b> Re: [Eeglablist] magnitude squared coherence - trial averaging<o:p></o:p></span></p>
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<p class="MsoNormal">Dear Germano,<o:p></o:p></p>
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<p class="MsoNormal">Check out Tim Mullen's SIFT.<o:p></o:p></p>
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<p class="MsoNormal"><a href="http://sccn.ucsd.edu/wiki/SIFT">http://sccn.ucsd.edu/wiki/SIFT</a><o:p></o:p></p>
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<p class="MsoNormal"><a href="http://sccn.ucsd.edu/mediawiki/images/d/d2/SIFT_manual_0.1a.pdf">http://sccn.ucsd.edu/mediawiki/images/d/d2/SIFT_manual_0.1a.pdf</a><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#073763">> (3) Do the number of trials per condition influence the computation of the magnitude squared coherence?</span><o:p></o:p></p>
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<p class="MsoNormal">I guess so. More trials, more computation, better SNR.<o:p></o:p></p>
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<p class="MsoNormal">Makoto<o:p></o:p></p>
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<p class="MsoNormal">On Wed, Jul 2, 2014 at 2:30 AM, Germano Gallicchio <<a href="mailto:germano.gallicchio@gmail.com" target="_blank">germano.gallicchio@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#073763">Dear EEGLAB users,<br>
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I am computing the magnitude squared coherence between electrode pairs.<br>
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(1) Is there any EEGLAB function to compute this specific kind of coherence measure?<br>
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(2) I am currently using the MATLAB function mscohere(), which takes several arguments including the 2 vectors that I want to compare.<br>
Naturally I have several trials per condition and I am not sure which of the following procedures is the correct one:
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a. average trials per condition (like I would do for ERPs) and then compute the coherence over these trial-averaged vectors<br>
b. compute coherence for each trial and then average the single-trial coherence, per condition<br>
Could any of you please help me select the right procedure?<br>
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(3) Do the number of trials per condition influence the computation of the magnitude squared coherence?<br>
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Thanks for your time.<br>
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All the best</span><span style="font-family:"Verdana","sans-serif";color:#888888"><br>
<span class="hoenzb">Germano</span><br clear="all">
</span><span style="font-family:"Verdana","sans-serif";color:#073763"><o:p></o:p></span></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">Makoto Miyakoshi<br>
Swartz Center for Computational Neuroscience<br>
Institute for Neural Computation, University of California San Diego<o:p></o:p></p>
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