<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Stephan,<div><br></div><div>Did you do anything else to the data besides applying SSS? I use SSS on all my data and haven't encountered this problem before. Does it apply to all your datasets or just one specific file?</div><div><br></div><div>Laurence</div><div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div class="AppleMailSignature" id="17D31EC3-297A-4FA6-B7EE-EE06DE0A8243"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">===========================================</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Laurence Hunt, DPhil Student</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "> Centre for Functional MRI of the Brain (FMRIB), </div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">University of Oxford</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="mailto:lhunt@fmrib.ox.ac.uk">lhunt@fmrib.ox.ac.uk</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Phone: (+44)1865-(2)22738</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">===========================================</div></div></div></div></div></span></div></span></div></span></span>
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<br><div><div>On 17 Jun 2011, at 08:01, Stephan Moratti wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">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 class="Apple-interchange-newline"><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">frank@greenant.net</a> <span dir="ltr"><<a href="mailto:fieldtrip@greenant.net">fieldtrip@greenant.net</a>></span> wrote:<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>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 class="h5"><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:0 0 0 .8ex;border-left:1px #ccc solid;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> <a href="http://greenant.net/temp/EOG_analysis.m" target="_blank">http://greenant.net/temp/EOG_analysis.m</a><br> _______________________________________________<br> fieldtrip mailing list<br> <a href="mailto:fieldtrip@donders.ru.nl" target="_blank">fieldtrip@donders.ru.nl</a><br> <a href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip" target="_blank">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br> </blockquote></div><br></div> _______________________________________________<br>fieldtrip mailing list<br><a href="mailto:fieldtrip@donders.ru.nl" target="_blank">fieldtrip@donders.ru.nl</a><br><a href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip" target="_blank">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a></blockquote> </div><br></div></div></div><br>_______________________________________________<br> fieldtrip mailing list<br> <a href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a><br> <a href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip" target="_blank">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br></blockquote></div><br></div> _______________________________________________<br>fieldtrip mailing list<br><a href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a><br><a href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a></blockquote></div><br><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div><br class="Apple-interchange-newline">________________________________________________________</div><div>Stephan Moratti, PhD<br><br></div><div>see also: <a href="http://web.me.com/smoratti/">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">smoratti@psi.ucm.es</a><br>Tel.: +34 679219982<br><br></div></span></div></span></div></span></div></span></div></span></div></span> </div><br></div>_______________________________________________<br>fieldtrip mailing list<br><a href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a><br><a href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a></blockquote></div><br></div></body></html>