Hello everyone.<br><br>I am new to fieldtrip, and using "cluster based statistics", I am using "cfg.clusterstatistics=wcm" as my option. Can any experience field-tripper suggest suitable value of<b> "cfg.wcm_weight"</b>,<br>
<br>Thanks<br><br>Sheraz<br><br><div class="gmail_quote">On Fri, Jun 17, 2011 at 3:01 AM, Stephan Moratti <span dir="ltr"><<a href="mailto:smoratti@psi.ucm.es">smoratti@psi.ucm.es</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div style="word-wrap: break-word;">Hello everybody,<div><br></div><div>I had no problems reading Neuromag data, but when I want to read data treated with SSS I get the following error:</div><div><br></div><div><div>??? Error using ==> fiff_read_tag at 232</div>
<div>Cannot handle other than dense or sparse matrices yet</div><div><br></div><div>Error in ==> fiff_open at 80</div><div> tag = fiff_read_tag(fid,dirpos);</div><div><br></div><div>Error in ==> fiff_read_meas_info at 82</div>
<div> [ fid, tree ] = fiff_open(source);</div><div><br></div><div>Error in ==> ft_read_header at 1049</div><div> orig = fiff_read_meas_info(filename);</div><div><br></div><div>Error in ==> mytrialfun_Neuromag_face at 3</div>
<div>hdr = ft_read_header(cfg.dataset);</div><div><br></div><div>Error in ==> ft_definetrial at 139</div><div> trl = feval(cfg.trialfun, cfg);</div><div><br></div><div>Any idea, what I could do?</div></div><div><br>
</div><div>Best,</div><div><br></div><div>Stephan</div><div><br></div><div><br></div><div><div>El 17/06/2011, a las 0:37, Rodolphe Nenert escribió:</div><br><blockquote type="cite">Im still afraid that the power of this analysis will be very low.<div>
Maybe you can try an ICA on your fMRI data and try to correlate each component with your EOG timecourse.</div><div><br></div><div>Rodolphe N.<br><br><div class="gmail_quote"> On Thu, Jun 16, 2011 at 1:16 PM, <a href="mailto:frank@greenant.net" target="_blank">frank@greenant.net</a> <span dir="ltr"><<a href="mailto:fieldtrip@greenant.net" target="_blank">fieldtrip@greenant.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div style="word-wrap: break-word;"><div>It's a bit of a unique experiment, we're trying to use an ECG machine</div>
<div>to acquire EOG, so it's only a single output channel.</div><div><br></div><div>i guess what I need is a temporal ICA rather than a spatial one...</div> <div><div></div><div><br><div><div>On 17/06/2011, at 2:48 AM, Rodolphe Nenert wrote:</div>
<br><blockquote type="cite">To summarize, the ICA will decompose your signal into as many components as Electrodes.<div> Therefore, trying to decompose only one source is useless.</div><div>Did you use a full net of electrodes into your MRI machine or only EOG electrodes?</div>
<div><br></div><div>Hope this helps, </div><div><br></div><div>Rodolphe N.<br><br><div class="gmail_quote">On Thu, Jun 16, 2011 at 11:42 AM, <a href="mailto:frank@greenant.net" target="_blank">frank@greenant.net</a> <span dir="ltr"><<a href="mailto:fieldtrip@greenant.net" target="_blank">fieldtrip@greenant.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">I am trying to use fieldtrip to filter EOG data obtained in an MRI.<br> I want to be able to spot the saccades in the samples and ideally measure their onset at the<br>
end of each trial.<br> <br> As you may guess, it's quite noisy and it's broad spectrum noise, despite pre-filtering.<br> <br> Ideally, I would like to isolate the component that corresponds to the MRI interference<br>
and then filter this out.<br> <br> I have managed to import the data and can run ft_componentanalysis<br> but it fails with:<br> <br> runica() - data size (1,30720) too small<br> <br> My data is single channel, 40 epochs, each of 6 seconds (time locked to stim onset but not saccade onset)<br>
Is there a different method I should be using?<br> <br> I have posted some sample data and the current script (which reads in the<br> data and runs preprocessing) to the following urls:<br> <br> <a href="http://greenant.net/temp/1_2_MRI_2011-04-29%2016:19:33.mat" target="_blank">http://greenant.net/temp/1_2_MRI_2011-04-29%2016:19:33.mat</a><br>
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<br>________________________________________________________</div><div>Stephan Moratti, PhD<br><br></div><div>see also: <a href="http://web.me.com/smoratti/" target="_blank">http://web.me.com/smoratti/</a><br><br></div><div>
Universidad Complutense de Madrid</div><div>Facultad de Psicología</div><div>Departamento de Psicología Básica I</div><div>Campus de Somosaguas</div><div>28223 Pozuelo de Alarcón (Madrid)</div><div>Spain</div><div><br></div>
<div>and</div><div><br></div><div>Center for Biomedical Technology</div><div>Laboratory for Cognitive and Computational Neuroscience</div><div>Parque Científico y Tecnológico de la Universidad Politecnica de Madrid<br>Campus Montegancedo</div>
<div>28223 Pozuelo de Alarcón (Madrid)</div><div>Spain<br><br><br>email: <a href="mailto:smoratti@psi.ucm.es" target="_blank">smoratti@psi.ucm.es</a><br>Tel.: <a href="tel:%2B34%20679219982" value="+34679219982" target="_blank">+34 679219982</a><br>
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