<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><font class="Apple-style-span" face="Arial" size="5"><span class="Apple-style-span" style="font-size: 18px;">Hi everyone,</span></font><div><font class="Apple-style-span" face="Arial" size="5"><span class="Apple-style-span" style="font-size: 18px;"><br></span></font></div><div><font class="Apple-style-span" face="Arial" size="5"><span class="Apple-style-span" style="font-size: 18px;">Thanks Alexandre for the info. I went a little bit through the FT code and it seems that it reads the raw data without applying the SSP vectors on the data (raw.proj is empty!!). I saw in mne_ex_read_raw.m that you have to activate the projectors and then get the proj matrix with mne_make_projector_info</span></font></div><div><font class="Apple-style-span" face="Arial" size="5"><span class="Apple-style-span" style="font-size: 18px;">.m</span></font></div><div><font class="Apple-style-span" face="Arial" size="5"><span class="Apple-style-span" style="font-size: 18px;">It is a chan by chan matrix. So adding the proj matrix to the raw structure I understand that by using fiff_read_raw_segment</span></font></div><div><font class="Apple-style-span" face="Arial" size="5"><span class="Apple-style-span" style="font-size: 18px;">.m I get the data filtered by the SSP vectors. So now my stupid? question: If I just multiply the grad.tra matrix by the proj matrix, this would fix everything (plotting topos and leadfield calculation???)</span></font></div><div><font class="Apple-style-span" face="Arial" size="5"><span class="Apple-style-span" style="font-size: 18px;"><br></span></font></div><div><font class="Apple-style-span" face="Arial" size="5"><span class="Apple-style-span" style="font-size: 18px;">best,</span></font></div><div><font class="Apple-style-span" face="Arial" size="5"><span class="Apple-style-span" style="font-size: 18px;"><br></span></font></div><div><font class="Apple-style-span" face="Arial" size="5"><span class="Apple-style-span" style="font-size: 18px;">Stephan</span></font></div><div><font class="Apple-style-span" face="Courier" size="5"><span class="Apple-style-span" style="font-size: 18px; "> </span><span class="Apple-style-span" style="font-size: 18px; "><br></span></font><div><div>El 03/06/2011, a las 15:30, Alexandre Gramfort escribió:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Hi everyone,<br><br><blockquote type="cite">I don't know enough about the elekta-software/mne-software to know what is<br></blockquote><blockquote type="cite">happening to the data when the ssp vectors are computed, but once we know<br></blockquote><blockquote type="cite">enough details it should be straightforward to build it into fieldtrip.<br></blockquote><br>SSP vectors are stored in fif files and applied to data only if requested.<br><br>In a typical MNE workflow, the SSP vectors are no directly applied to the raw<br>file (avoid data duplication on disk) but rather to the noise covariance matrix<br>and consequently in the whitening matrix. When computing an inverse solution,<br>the whitening matrix is used on the data and the lead field, hence taking<br>into account the SSP vectors.<br><br>Hope this helps.<br><br>-- <br>Alexandre Gramfort, PhD<br><a href="mailto:gramfort@nmr.mgh.harvard.edu">gramfort@nmr.mgh.harvard.edu</a><br>Dept. of Radiology MGH Martinos Center / Harvard Medical School<br>http://www-sop.inria.fr/members/Alexandre.Gramfort/<br>_______________________________________________<br>fieldtrip mailing list<br>fieldtrip@donders.ru.nl<br>http://mailman.science.ru.nl/mailman/listinfo/fieldtrip<br></div></blockquote></div><br><div>
<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-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; color: rgb(0, 0, 0); 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; color: rgb(0, 0, 0); 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; color: rgb(0, 0, 0); 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>
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